Exam 1

f a random variable is normally distributed with mean 10 and standard deviation 1, 68% of its possible values fall between ____________ and ____________. A. -∞, ∞ B. 7, 13 C. 8, 12 D. 9, 11

9,11

Which of the following can be used to display both quantitative data and qualitative data? A.Frequency distribution. B.Histogram. C.Pie charts. D.Bar charts.

Frequency Distribution

The ____________ is the value that appears most often in a data set. A. outlier B. median C. mode D. mean

mode

______________ are values that can take on any real numbers, including numbers that contain decimal points. (Hint: Section 2.2) A.Cross-sectional data B.Continuous data C.Time series data D.Discrete data

Continuous Data

All outcomes in a probability distribution must _____________. A. have probabilities < 1 B. have probabilities > 0 C. be mutually exclusive D. be independent

be mutually exclusive

"Randomly choose 5 out of 100 classes and include every student in each class to participate in a survey" is an example of __________. A.stratified sampling B. cluster sampling C. systematic sampling D. simple random sampling

cluster sampling

Standard normal distribution has mean _________ and standard deviation _________. A. ∞, 1 B. 1, ∞ C. 1, 1 D. 0, 1

0,1

The total area under the curve of the normal probability distribution is always equal to ___________. A. 0.5 B. 1 C. 0.95 D. 0.68

1

What constitute a discrete probability distribution? A. A list of all possible outcomes B. A list of all relative frequencies C. Both of the above D. The first two above and the cumulative relative frequencies

Both of the above

In P(X > 14) = 1 - P(X ≤ 14), which rule/formula of the following is applied? A. Addition rule. B. Conditional probability. C. Complement rule. D. Multiplication rule.

Complement rule

Which of the following Excel functions can be used to determine a probability of a standard normal distribution? A. NORM.S.DIST B. VAR.S C. BINOM.S.DIST D. STDEV.S

NORM.S.DIST

The ___________ is a continuous distribution that is bell shaped and symmetrical around its mean. A. Binomial Distribution B. Exponential Distribution C. Normal Distribution D. Uniform Distribution

Normal Distribution

One method to determine the number of classes in the frequency distribution is the 2^k≥n rule. What is k? (Hint: Section 2.2) A.Class boundaries. B.Number of data points. C.Number of classes. D. Class width

Number of classes

______________ are a specific type of bar charts used in quality control programs by businesses to display the cause of problems graphically. (Hint: Section 2.3) A. Clustered bar charts B. Histograms C. Stacked bar charts D. Pareto charts

Pareto Charts

Which of the following are statistics? A.Population variance. B.Population mean. C.Population and sample standard deviations. D.Sample mode and sample median

Sample mode and sample median

Which of the following are statistics? A. Population variance. B. Population mean. C. Population and sample standard deviations. D. Sample mode and sample median.

Sample mode and sample median

Which of the following statements about sampling errors is true? A. A larger sample will always give a larger sampling error. B. Sampling errors are always positive. C. Sampling errors can differ from one sample to the next. D. No answer text provided.

Sampling errors can differ from one sample to the next.

A __________ is a sample in which the probability of a population member being selected for the sample is not known. A. non probability sampling B. systematic sampling C. probability sampling D. simple random sampling

non probability

A binomial random variable is the _____________ that will be observed from a binomial experiment. A. number of successes B. probability of success C. probability of failure D. number of trials

number of successes

Which of the following notations represents the sample variance? A. overline{x} B. s^2 C. mu D. sigma^2

s^2

Which of the following notations represents the sample variance? A. x B. s^2 C. u D. o^2

s^2

The sampling distribution of the mean describes the pattern that ____________ tend to follow when randomly drawn from a population. A. population data B. sample data C. sample averages D. population mean

sample averages

Records of the amount of time a customer spends on the phone with a cable company's customer service representative is an example of ___________. A. probability B. binomial random variable C. continuous data D. discrete data

continuous data

A __________ sample is used when members of the population are chosen to become part of the sample simply because they are easily accessible. A.probability B. systematic C. convenience D. simple random

convenience

The Central Limit Theorem states that the sample means of ________ samples will follow a normal distribution regardless of the shape of their population distributions. A. small-sized B.large-sized C.any

large-sized

If you display discrete data in a chart, you should ____________, A. use overlapping classes B.use a pie chart C.leave gaps between bars D. use empty classes

leave gaps between bars

Which of the following are measures of central tendency? A. Variance and standard deviation. B. Mean and mode. C. Median and variance. D. Mode and standard deviation.

mean and mode

Which of the following are measures of central tendency? A.Variance and standard deviation. B.Mean and mode. C.Median and variance. D. Mode and standard deviation.

mean and mode

The ____________ is the value that appears most often in a data set. A.outlier B.median C.mode D.mean

mode

A __________ is selected and analyzed to make an assessment of the __________. A. parameter, statistic B. sample, population C. probability, statistics D. population, sample

sample, population

"Use the sampling tool in Excel's Data Anaysis Toolpak to select 10 students at random out of 1800 total students to participate in a survey" is an example of __________. A.stratified sampling B. cluster sampling C. convenience sampling D. simple random sampling

simple random sampling

For a normal probability distribution, a __________ standard deviation results in a skinnier curve that is tighter and taller around the mean. A. continuous B. smaller C. larger D. discrete

smaller

The ____________ measures the dispersion of the outcome of the discrete random variable in relation to the distribution's mean. A. standard deviation B. expected value C. probability D.frequency

standard deviation

At IU, 20% of the students are graduate students. I construct a random sample that consists of 20% graduate students from the student population to ask what their opinions are of the college's food service. This is __________. A.stratified sampling B. cluster sampling C. systematic sampling D. simple random sampling

stratified sampling

In a __________ frequency distribution, the mean and median are roughly equal to each other. (Hint: Section 3.1) A. left-skewed B. symmetrical C. right-skewed D. consistent

symmetrical

In a __________ frequency distribution, the mean and median are roughly equal to each other. (Hint: Section 3.1) A.left-skewed B.symmetrical C.right-skewed D. consistent

symmetrical

The standard error of the mean is ____________. A. the sampling error of the sample mean B. the standard deviation of the sample means C. the mean of the sample means D. population standard deviation

the sampling error of the sample mean

The ______________ is a single value that describes how much spread is present in the data. A. variability B.z-score C. distribution D. central tendency

variability

The ______________ is a single value that describes how much spread is present in the data. A. variability B. z-score C. distribution D. central tendency

variability