Deck 18: Testing Hypotheses

Question 1

Answer 1

E

Question 2

Answer 2

A

Question 3

Answer 3

B

Question 4

A manufacturer claims that the mean amount of juice in its 16 ounce bottles are 16.1 ounces. A consumer advocacy group wants to perform a hypothesis test to determine whether the
Mean amount is actually less than this.

A)Lower-tailed
B)Two-sided
C)Upper-tailed

Question 5

A pharmaceutical company wants to answer the question whether it takes longer than 45 seconds for a drug in pill form to dissolve in the gastric juices of the stomach.A sample was
Taken from patients taking the given drug in pill form and times for the pills to be dissolved
Were measured.State assumptions of the test.
I)The subjects must be part of a medical study group investigating the drug.
II)The subjects in the sample must be randomly selected from a population.
III)The sample data must come from a normally distributed population of observations for
The variable under study.

A)I only
B)II only
C)III only
D)II and III
E)None of these

Question 6

Question 7

Question 8

Question 9

Question 10

The owner of a football team claims that the average attendance at games is over 74,900, and he is therefore justified in moving the team to a city with a larger stadium.An independent
Investigator will conduct a hypothesis test to determine whether his claim is accurate.

A)Lower-tailed
B)Upper-tailed
C)Two-sided

Question 11

Data in 1980 showed that about 40% of the adult population had never smoked cigarettes.In 2004, a national health survey interviewed a random sample of 2000 adults and found that
50% had never been smokers.Create a 95% confidence interval for the proportion of adults
(in 2004) who had never been smokers.

A)Based on the data, we are 95% confident the proportion of adults in 2004 who had never smoked cigarettes is between 47.8% and 52.2%.
B)Based on the data, we are 95% confident the proportion of adults in 2004 who had never smoked cigarettes is between 37.4% and 52.2%.
C)Based on the data, we are 95% confident the proportion of adults in 2004 who had never smoked cigarettes is between 47.8% and 58.2%.
D)Based on the data, we are 95% confident the proportion of adults in 2004 who had never smoked cigarettes is between 40% and 60%.
E)Based on the data, we are 95% confident the proportion of adults in 2004 who had never smoked cigarettes is between 47.8% and 63.2%.

Question 12

Using the t-tables, software, or a calculator, estimate the critical value of t for the given confidence interval and degrees of freedom: 99% confidence interval with df = 24

A)2.492
B)2.797
C)2.807
D)2.779
E)1.711

Question 13

Question 14

Question 15

Question 16

The manufacturer of a refrigerator system produces refrigerators that are supposed to maintain a true mean temperature, μ, of 48°F, ideal for certain beverages.The owner of a
Beverage company does not agree with the refrigerator manufacturer, and will conduct a
Hypothesis test to determine whether the true mean temperature differs from this value.

A)Two-sided
B)Upper-tailed
C)Lower-tailed

Question 17

In the past, the mean running time for a certain type of flashlight battery has been 8.5 hours. The manufacturer has introduced a change in the production method and wants to perform a
Hypothesis test to determine whether the mean running time has changed as a result.

A)Lower-tailed
B)Upper-tailed
C)Two-sided