# Manufacturers use random samples to test whether or not their product

A) Yes

B) No

C) Not enough data

D) None of the above

A) Variability

B) Exactness

C) Randomness

D) None of the above

A) 36

B) 500

C) 500/36

D) None of the above

29 8 7 33 21 26 6 11 4 54 7 4

Use the point data to find a point estimate for the standard deviation.

A) Approximately 25.5

B) Approximately 15.5

C) Approximately 10.5

D) Approximately 5.5

A chicken farmer at Best Broilers claims that the chickens have a mean weight of 56 ounces.

A) H0 = μ = 56 vs Ha: μ ≠ 56

B) H0 = μ ≠ 56 vs Ha: μ = 56

C) H0 = μ = 56 vs Ha: μ = 56

D) None of the above

A) Dependent. The samples are taken from the same set of students.

B) Dependent. The samples are from two separate and different sets of students.

C) Independent. The two samples are from two separate and different sets of students.

D) Independent. The samples are taken from the same set of students.

A) Distribution of sample proportion, when the population proportion is 0.11

B) Distribution of sample proportion, when the population proportion is 0.25

C) Both are the same

D) None of the above

In this situation, the standard deviation from samples of 225 births is 0.02. If the sample size were decreased, the standard deviation would be

A) Smaller

B) Larger

C) The same

D) There is not enough information

If the probability of Caesarean birth is 0.30, and 140 in a sample of 500 births are Caesarean, which of these numbers is n?

A) 0.30

B) 140

C) 500

D) 140/500

Which of these is your best guess for the probability of a score being greater than 30?

A) 0.016

B) 0.036

C) 0.16

D) 0.36

What notation is used for the number 0.75?

A) p

B) p̂

C) p0

D) None of the above

Merck developed an AIDS vaccine that showed promise in initial tests. Unfortunately, in a subsequent test conducted internationally on a large group of volunteers, those vaccinated were no less likely to become infected than those who were not vaccinated. Apparently, Merck’s conclusion in the initial tests was

A) a Type I Error

B) a Type II Error

C) both (a) and (b)

D) neither (a) nor (b)

Suppose each student uses his or her sample to test the true null hypothesis that the population mean is 3.5 against the two-sided alternative. About how many of these 80 tests should reject at the α=0.05 level?

A) 0

B) 4

C) 8

D) 28

E) 52

N Mean St. DevSEMean

Public 5 7.26 1.48 0.66

Private 6 32.32 3.30 1.3

Difference = μ public – μ private

Estimate for differences: -25.06

T-Test of difference =0 (vs. not =): T-Value = XXXX P-Value = 0.000 DF=7

A) Paired study

B) Two-sample study

C) Both of the above

D) None of the above

A) include individuals who are all roughly the same age

B) include individuals spanning a wide range of ages

C) it doesn’t matter how similar or different the ages are

Which of these best describes the relative rates?

A) one of the resorts was much cheaper than the other two

B) one of the resorts was much more expensive than the other two

C) all three resorts’ rates were quite similar

A) x̄1 = x̄2 = x̄3

B) μ1 = μ2 = μ3

A) All three population means are different

B) Not all of the population means are different

C) Not all three population means are the same

A) Z-test

B) F-test

C) Chi-square

A) when the standard deviation is known and the sample population is normally distributed

B) when the sample population is normally distributed

C) Both a & b

D) None of the above