AP Stats AMSCO #3

After repeated observations, it has been determined that the waiting time at the drive through window of a bank...

.0042

An investigator anticipates that the proportion of red blossoms is his hybrid plants is .15. A random sample of 50 of his plants indicated that 22% were red.

.051

A sample of size 25 is drawn from a normal population with a mean of 62 and SD of sample mean is 3.5?

17.5

A manufacturer of power tools claims that based on tests of continuous use, the distribution of the motor lifetimes in...

Calculate the sample mean and standard deviation and use the t distribution to calculate the probability.

Which of the following is true regarding the variation of a sampling distribution of a sample proportion?

For a given sample size, the maximum variation in the sampling distribution of a population proportion occurs when the sample proportion is .5.

Which of the following are true? I. T- distribution centered at 0. II. The spread of t distribution is less III. A t distribution is used when o is

I and III.

Which of the following are true? I. A t distribution with 6 degrees of freedom II. A t distribution with 6 degrees of freedom III. A t distribution with an infinite number of

II and III

Which of the following best describes a sampling distribution of a statistic?

It is the distribution of all of the statistics calculated from all possible samples of the same size.

Which of the following statements are true regarding the histograms?

None of these statements are true.

The distribution of SAT Math scores of students taking Calculus I at a large university is skewed left with a man of 625 and a SD of 44.5

Normal with mean 625 and SD 4.45

The conditions that np > 10 and n(1-p) >10 are tested for a sampling distribution to check for

Skewness in the distribution

Two simple random samples of 50 undergraduates each from two universities are taken...

The enrollment figures from the two universities are not relevant...

Which of the following is true regarding the mean of the proportion of sixes from each simulation?

The mean of the proportion of sixes for the 1,000 simulations will be a better..

A school district had anticipated that the percentages of boys and girls who planned..

The mean of the sampling distribution is 0 with SD .1857

Which of the following statements regarding the sampling distribution of sample means is incorrect?

The standard deviation of the sampling distribution is the standard deviation of the population.

A simple random sample of 100 high schoolers seniors in a certain suburb reveals that 65% of them...

an unbiased estimator of the population proportion.

Records at a large university indicated that 20% of all freshmen are placed on academic probation at the end of their first semester.

are not surprising since the standard deviation of the sampling distribution is 4%

The condition that two samples are independent when considering the sampling distribution of a sample proportion is important because:

if the samples are not independent, we cannot calculate a combined standard deviation of the distribution.

A simple random of 50 adults were asked to reveal their gross annual incomes. The variance of this sample:

is an estimate of the variance of the population but may differ from the variance of the population.

In calculating the standard deviation of the sampling distribution of a difference of sample proportions,

it is essential to use population proportions so that the Central Limit Theorem applies.

The sampling distribution of the difference of two sample proportions depends on:

p1, p2, and n1, n2

A sample of size 49 is drawn from a normal population with a mean of 63 and SD of 14

µ= 63 o= 2