BANA Final

The measure of variability easiest to compute, but seldom used as the only measure, is the _____.

Range

Excel's _____ function can be used to compute the sample standard deviation.

STDEV.S

Excel's _____ function can be used to compute the expected value of a discrete random variable.

SUMPRODUCT

A subset of a population selected to represent the population is a _____.

Sample

A probability distribution for all possible values of a sample statistic is known as a _____.

Sampling distribution

The standard deviation of is referred to as the _____.

Standard error of the mean.

Refer to Exhibit 6-4. What is the random variable in this experiment?

Starting salarie

Which of the following is NOT a characteristic of an experiment where the binomial probability distribution is applicable?

The trials are dependent.

A sample of 400 observations will be taken from a process (an infinite population). The population proportion equals .8. The probability that the sample proportion will be greater than 0.83 is _____.

.0668

A sample of 51 observations will be taken from a process (an infinite population). The population proportion equals .85. The probability that the sample proportion will be between .9115 and .946 is _____.

.0819

Refer to Exhibit 5-10. The probability that Pete will catch fish on exactly 1 day is _____.

.096

Refer to Exhibit 8-2. The standard error of the mean equals _____.

.1

The random variable x is known to be uniformly distributed between 70 and 90. The probability of x having a value between 80 and 95 is _____.

.5

If P(A) = .75, P(A ∪ B) = .86, and P(A ∩ B) = .56, then P(B) =

.67

Refer to Exhibit 6-6. What is the probability that a randomly selected tire will have a life of exactly 47,500 miles?

0

As the number of degrees of freedom for a t distribution increases, the difference between the t distribution and the standard normal distribution _____.

becomes smaller

When the level of confidence increases, the confidence interval _____.

becomes wider

If you are conducting an experiment where the probability of a success is .02 and you are interested in the probability of two successes in 15 trials, the correct probability function to use is the _____.

binomial probability functio

Excel's POISSON.DIST function can be used to compute _____.

both Poisson probabilities and cumulative Poisson probabilities

For the standard normal probability distribution, the area to the left of the mean is _____.

0.5

Refer to Exhibit 8-3. If we are interested in determining an interval estimate for μ at 86.9% confidence, the z value to use is _____.

1.51

Refer to Exhibit 5-7. The expected number of cups of coffee is _____.

1.2

Refer to Exhibit 5-5. The standard deviation is _____.

1.431

Refer to Exhibit 2-1. The midpoint of the last class is _____.

35

Excel's BINOM.DIST function has how many inputs?

4

Refer to Exhibit 7-4. The point estimate of the mean content of all bottles is _____.

4

Twenty percent of the students in a class of 100 are planning to go to graduate school. The standard deviation of this binomial distribution is _____.

4

Refer to Exhibit 3-2. The standard deviation is _____.

4.062

The empirical rule states that, for data having a bell-shaped distribution, the portion of data values being within one standard deviation of the mean is approximately _____.

68%

A random sample of 25 statistics examinations was selected. The average score in the sample was 76 with a sample variance of 144. Assuming the scores are normally distributed, the 99% confidence interval for the population average examination score is _____.

69.29 to 82.71

Which of the following symbols represents the size of a population?

N

The percent frequency of a class is computed by _____.

multiplying the relative frequency by 100

Given that event E has a probability of .25, the probability of the complement of event E _____.

must be .75

Which of the following symbols represents the size of a sample?

n

In determining an interval estimate of a population mean when σ is unknown, we use a tdistribution with _____ degrees of freedom.

n - 1

In computing the standard error of the mean, the finite population correction factor is NOT used when

n/N ≤ 0.05

In computing the standard error of the mean, the finite population correction factor is NOT used when _____.

n/N ≤ 0.05

We can use the normal distribution to make confidence interval estimates for the population proportion, p, when _____.

np ≥ 5 and n(1 − p) ≥ 5

Statistical studies in which researchers do not control variables of interest are _____.

observational studies

The general form of an interval estimate of a population mean or population proportion is the _____ plus or minus the _____.

point estimate, margin of error

Revised probabilities of events based on additional information are _____.

posterior probabilities

The age of employees at a company is an example of _____.

quantitative data

When the data have the properties of interval data and the multiplication or division of two values is meaningful, the variable has which scale of measurement?

ratio

When the results of experimentation or historical data are used to assign probability values, the method used to assign probabilities is referred to as the _____.

relative frequency method

A numerical measure computed from a sample, such as sample mean, is known as a _____.

sample statistic

The probability distribution of all possible values of the sample mean is called the ____.

sampling distribution of the sample mean

Which of the following is an example of categorical data?

social security number

For the interval estimation of μ when σ is assumed known, the proper distribution to use is the_____.

standard normal distribution

The addition law is potentially helpful when we are interested in computing the probability of _____.

the union of two events

Chebyshev's theorem is applicable

to any data set

A graphical method of representing the sample points of a multiple-step experiment is a(n) _____.

tree diagram

In Excel, the line of best fit for the points in a scatter diagram is called a _____.

trendline

Larger values of the standard deviation result in a normal curve that is _____.

wider and flatter

If two events are mutually exclusive, then the probability of their intersection _____.

will be equal to 0

Excel's NORM.S.DIST function can be used to compute _____.

cumulative probabilities for a standard normal z value

The owner of a factory regularly requests a graphical summary of all employees' salaries. The graphical summary of salaries is an example of _____.

descriptive statistics

Refer to Exhibit 5-11. The appropriate probability distribution for the random variable is _____.

discrete

Statistical studies in which researchers control variables of interest are _____ studies.

experimental

A __________ can be used to graphically present quantitative data.

histogram and a stem-and-leaf display

One of the basic requirements of probability is _____.

if there are k experimental outcomes, then P(E1) + P(E2) + ... + P(Ek) = 1

In statistics, what does IQR mean?

inter-quartile range

The symbol ∩ shows the _____.

intersection of events

When the data have the properties of ordinal data and the interval between observations is expressed in terms of a fixed unit of measure, the variable has which scale of measurement?

interval

Before drawing any conclusions about the relationship between two variables shown in a crosstabulation, you should _____.

investigate whether any hidden variables could affect the conclusions

Refer to Exhibit 2-1. The class width for this distribution _____.

is 10

The standard deviation of a standard normal distribution _____.

is always equal to 1

If a data set has an even number of observations, the median _____.

is the average value of the two middle items when all items are arranged in ascending order

For a uniform probability density function, the height of the function _____.

is the same for each value of x

Refer to Exhibit 5-2. The expected daily sales are _____

$56,000

Refer to Exhibit 7-3. The point estimate of the mean of the population is _____.

18.0

Refer to Exhibit 2-1. The cumulative frequency for the class of 20 to 30 is _____.

300

Which of the following values of r indicates the strongest correlation?

-.9

A production process produces 2% defective parts. A sample of five parts from the production process is selected. What is the probability that the sample contains exactly two defective parts?

.0038

A random sample of 150 people was taken from a very large population. Ninety of the people in the sample were females. The standard error of the proportion of females is _____.

.0400

A population has a mean of 53 and a standard deviation of 21. A sample of 49 observations will be taken. The probability that the sample mean will be greater than 57.95 is _____.

.0495

Refer to Exhibit 6-3. The probability of a player weighing more than 241.25 pounds is _____.

.0495

Refer to Exhibit 5-8. What is the probability that among the students in the sample at least 7 are female?

.1064

Refer to Exhibit 6-1. The probability density function has what value in the interval between 20 and 28?

.1225

If a coin is tossed three times, the likelihood of obtaining three heads in a row is _____.

.125

Assume z is a standard normal random variable. Then P(1.05 ≤ z ≤ 2.13) equals _____

.1303

Refer to Exhibit 7-2. The point estimate of the proportion in the population who will respond "yes" is _____.

.75

The assembly time for a product is uniformly distributed between 6 and 10 minutes. The probability of assembling the product in 7 minutes or more is _____.

.75

Assume z is a standard normal random variable. Then P(-1.5 ≤ z ≤ 1.09) equals _____.

.7953

If an interval estimate is said to be constructed at the 90% confidence level, the confidence coefficient would be _____.

.90

Refer to Exhibit 5-2. The probability of having sales of at least $50,000 is _____.

.90

For a standard normal distribution, the probability of obtaining a z value of less than 1.6 is _____.

.9452

A population has a mean of 84 and a standard deviation of 12. A sample of 36 observations will be taken. The probability that the sample mean will be between 80.54 and 88.9 is _____.

.9511

Refer to Exhibit 5-7. The variance of the number of cups of coffee is _____.

.96

If P( A) = .38, P( B) = .83, and P( A ∩ B) = .24; then P( A ∪ B) =

.97

Refer to Exhibit 6-3. The probability of a player weighing less than 250 pounds is _____.

.9772

Telephone calls arrive at the Global Airline reservation office in Louisville according to a Poisson distribution with a mean of 1.2 calls per minute. What is the probability of receiving exactly 2 calls during a one-minute interval?

0.22

The sum of the relative frequencies for all classes of a relative frequency histogram will always equal _____.

1

Given that z is a standard normal random variable, what is the value of z if the area to the right of z is .1401?

1.08

Refer to Exhibit 3-2. The variance is _____.

16.5

A continuous random variable is uniformly distributed between a and b. The probability density function between a and b is _____.

1/(b − a)

A point estimate of the population mean is _____.

18

A simple random sample of 64 observations was taken from a large population. The population standard deviation is 120. The sample mean was determined to be 320. The standard error of the mean is _____.

15

Refer to Exhibit 5-10. The expected number of days Pete will catch fish is _____.

2.4

The expected value for a binomial probability distribution is _____

E(x) = np

Refer to Exhibit 8-2. The 95% confidence interval for the average checkout time for all customers is _____.

2.804 to 3.196

A professor rolls a fair, six-sided die. Using the classical method of probability, what is the probability that at least three spots will be showing up on the die?

2/3

Random samples of size 36 are taken from a process (an infinite population) whose mean and standard deviation are 20 and 15, respectively. The distribution of the population is unknown. The mean and the standard error of the distribution of sample means are _____.

20 and 2.5

A random sample of 36 students at a community college showed an average age of 25 years. Assume the ages of all students at the college are normally distributed with a standard deviation of 1.8 years. The 98% confidence interval for the average age of all students at this college is _____.

24.301 to 25.699

Refer to Exhibit 2-1. The percentage of students working less than 20 hours is _____.

25%

What percentage of people surveyed live with 3 or less people?

30%

Refer to Exhibit 2-1. If a cumulative frequency distribution is developed for the above data, the last class will have a cumulative frequency of _____.

400

Refer to Exhibit 3-1. The mode is _____.

5

The use of the normal probability distribution as an approximation of the sampling distribution of is based on the condition that both np and n(1 - p) equal or exceed _____.

5

A population consists of 8 items. The number of different simple random samples of size 3 (without replacement) that can be selected from this population is _____c

56

Refer to Exhibit 8-3. The 86.9% confidence interval for μ is _____.

57.735 to 62.265

Refer to Exhibit 3-1. The median is _____.

6

It is known that the population variance equals 484. With a .95 probability, the sample size that needs to be taken to estimate the population mean if the desired margin of error is 5 or less is

75

Refer to Exhibit 6-4. What percentage of MBAs will have starting salaries of $34,000 to $46,000?

76.98%

Excel's __________ can be used to construct a frequency distribution for categorical data.

COUNTIF function

Refer to Exhibit 5-4. The probability of at least 3 breakdowns in a month is _____.

None of the answers is correct

If A and B are mutually exclusive, then _____.

P(A I B) = 0

Refer to Exhibit 5-11. The random variable x satisfies which of the following probability distributions?

Poisson

In the textile industry, a manufacturer is interested in the number of blemishes or flaws occurring in each 100 feet of material. The probability distribution that has the greatest chance of applying to this situation is the _____.

Poisson distribution

Excel's _____ function can be used to compute the sample variance.

VAR.S

In general, higher confidence levels provide _____

Wider confidence intervals.

The binomial probability distribution is used with _____.

a discrete random variable

A box plot is a graphical representation of data that is based on _____.

a five-number summary

A standard normal distribution is a normal distribution with _____.

a mean of 0 and a standard deviation of 1

Convenience sampling is an example of __________.

a nonprobability sampling technique

Of 800 students in a university, 360, or 45%, live in the dormitories. The 800 is an example of _____.

a population

A continuous random variable may assume _____.

all values in an interval or collection of intervals

Which of the following is NOT an example of descriptive statistics?

an estimate of the number of Alaska residents who have visited Canada

For a population with an unknown distribution, the form of the sampling distribution of the sample mean is _____.

approximately normal for large sample sizes

The fact that the sampling distribution of the sample mean can be approximated by a normal probability distribution whenever the sample size is large is based on the _____.

central limit theorem

Posterior probabilities are _____.

conditional probabilities

Data collected at the same, or approximately the same, point in time are _____ data.

cross-sectional

All data collected in a study are referred to as the _____.

data set

A marketing manager instructs his team to make 80 telephone calls to attempt to sell an insurance policy. The random variable in this experiment is the number of sales made. This random variable is a _____.

discrete random variable

The relative frequency of a class is computed by _____.

dividing the frequency of the class by the sample size

A measure of the average value of a random variable is called a(n) _____.

expected value

Excel's Chart Tools does NOT have a chart type for constructing a _____.

stem-and-leaf display

Whenever the population standard deviation is unknown, which distribution is used in developing an interval estimate for a population mean?

t distribution

Refer to Exhibit 5-9. What is the random variable in this experiment?

the number of female voters out of 5

Stratified random sampling is a method of selecting a sample in which ______________.

the population is first divided into groups, and then random samples are drawn from each group