STATISTICS MA3110 Week 5 Quiz

MA3110 Week 5 Quiz

A poll is conducted with 1434 randomly selected US adults. The poll showed that 72% of the respondents support gun rights. The sample results are n=1434 and  . Find the Confidence Interval that corresponds to a 95% confidence level.
a) not possible
b) .6752<p<.7648
c) .6815<p<.7585
d) .6968<p<.7432

A poll is conducted with 1845 randomly selected U.S. adults the poll showed that 46% of the respondents believe in global warming the sample results are n= 1845 and p ?=0.46. find the margin of error that corresponds to 95% confidence level
  a)  Not possible the necessary requirements are not satisfied
  b)  0.4215<p< 0.4985
  c)  0.4485 <p< 0.4715
  d)  0.4373 <p< 0.4827

The mean MPG of a mid size sedan is 24.6 if a hypothesis test is performed how should you interpret a decision that rejects the null hypothesis?
A. There is sufficient evidence to support the claim ?  =24.6
B. There is no sufficient evidence to support the claim ? =24.6

Type I error is fail to reject Ho when it is false.

a. True
b. False

The critical value for a right-tailed test with a = 0.01 of a large population is:

a. 2.575
b. 1.960
c. 2.326
d. 1.645

Find the critical values for a sample with n = 10 and α = 0.05 if H0: μ≥20.

A) -1.833
B) -3.250
C) -2.262
D) -1.383
Suppose we are testing the following hypotheses: H0: µ=63 and H1: µ<63. Determine the nature of the hypothesis test.
A) Right-tailed test
B) Two-tailed test
C) Left-tailed test

Suppose we are testing the following hypotheses: H0: µ=25 and H1: µ>25. Determine the nature of the hypothesis test.
A) Right-tailed test
B) Two-tailed test
C) Left-tailed test

If I claim that the average score on the statistics final exam is greater than 70, what null hypothesis would you use for your hypothesis test?
A) µ ≥ 70
B) µ = 70
C) µ ≤ 70
D) µ > 70