AP Stat: Name the Test

A survey indicates 14 of 71 respondents brush their teeth multiple times per day

• 1 prop z int

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• 1 sample t int

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An IQ test was given to a simple random sample of 75 students at a certain college. The sample mean score was 105.2. Scores on this test are known to have a standard deviation of 10.

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A research company wants to estimate the proportion of people who like oatmeal to determine if the proportion has increased. They want the confidence level to be 95%. The company had questioned 325 randomly selected people and found 48% liked oatmeal, but in a recent survey of 250 people, only 45% liked oatmeal.

• 1 prop z int

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• 1 sample t int

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A quality control specialist at a glass factory must estimate the mean clarity rating for a new batch of glass using a sample of 18 glass sheets from the batch. The sample had a clarity rating of 4.3 with a standard deviation of 0.7. Past investigations show that clarity ratings are normally distributed N(4.2, 0.6)

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• 1 sample t test

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• paired t test

Thirty randomly selected students took the calculus final. If the sample mean was 92 and the standard deviation was 9.4, construct a 99 percent confidence interval for the mean score of all students from which the sample was gathered.

• 1 prop z int

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• 1 sample t int

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To assess the accuracy of a kitchen scale, a standard weight, known to weigh 1.000 gram, is weighed a total of 36 times, and the mean of the 36 weight measurements is computed. Is the scale accurate?

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• 1 sample t test

• 2 sample t test

• paired t test

In a random sample of 1000 adult Americans, only 430 could name at least one justice who is currently serving on the US Supreme Court. In a similar random sample of 1000 adults in Canada, 475 could name at least one of the justices in their highest court.

• 1 sample z test

• 2 sample z test

• 1 sample t test

• 2 sample t test

• paired t test

A mayor is concerned about the percentage of city residents who express disapproval of his job performance. His political committee surveys 27 voters about his performance and find each voter's average disapproval rating. They then show them a potential newspaper ad, which they are hoping will keep his disapproval rating below 21%. The 27 voters are then asked about his performance. They will use a follow up poll to access effectiveness.

• 1 prop z test

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• 1 sample t test

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• paired t test

In an effort to assess teaching methods, one class is taught using traditional methods and then given a test. Another class is taught using a flipped class and then given the same test.

• 1 prop z test

• 2 prop z test

• 1 sample t test

• 2 sample t test

• paired t test

In a recent survey, the average amount of money

students have in their pockets is $5.40 with a standard

deviation of $1.20. A teacher feels that the average

amount is actually higher. She surveys 80 randomly

selected students and finds the average amount is

$5.50. At α = 0.05, test the teacher’s claim that the

average amount of money is actually higher than $5.40.

• 1 prop z test

• 2 prop z test

• 1 sample t test

• 2 sample t test

• paired t test