1. In an article appearing in Todays Health a writer states that the average number of calories...
Question:
1. In an article appearing in Today’s Health a writer states that the average number of calories in a serving of popcorn is 75. To determine if the average number of calories in a serving of popcorn is different from 75, a nutritionist selected a random sample of 20 servings of popcorn and computed the sample mean number of calories per serving to be 78 with a sample standard deviation of 7.
At the ? = .05 level of significance, does the nutritionist have enough evidence to reject the writer’s claim?
A.Yes
B.Cannot Determine
C.No
2. Smaller p-values indicate more evidence in support of the:
A. Alternative hypothesis
B. Null hypothesis
C. Quality of the researcher
D. The reduction of variance
3. Which of the following statements are true of the null and alternative hypotheses?
A. It is possible for both hypotheses to be true
B. It is possible for neither hypothesis to be true
C. Exactly one hypothesis must be true
D. Both hypotheses must be true
4. A null hypothesis can only be rejected at the 5% significance level if and only if:
A. The null hypotheses includes sampling error
B. A 95% confidence interval includes the hypothesized value of the parameter
C. A 95% confidence interval does not include the hypothesized value of the parameter
D. The null hypothesis is biased
5. A lab technician is tested for her consistency by taking multiple measurements of cholesterol levels from the same blood sample. The target accuracy is a variance in measurements of 1.2 or less. If the lab technician takes 16 measurements and the variance of the measurements in the sample is 2.2, does this provide enough evidence to reject the claim that the lab technician’s accuracy is within the target accuracy?
State the null and alternative hypotheses.
A.H0: ? ? ? 1.2, H 1 : ? ? = 1.2
B.H0: ? ? ? 1.2, H 1 : ? ? ? 1.2
C.H0: ? ? ? 1.2, H 1 : ? ? > 1.2
D.H0: ? ? < 1.2, H 1 : ? ? ? 1.2
Business Statistics a decision making approach
ISBN: 978-0133021844
9th edition
Authors: David F. Groebner, Patrick W. Shannon, Phillip C. Fry