## Question

# 1. A cereal manufacturer tests their equipment weekly to be assured that the proper amount of cereal is in each box of cereal. The company

1.A cereal manufacturer tests their equipment weekly to be assured that the proper amount of cereal is in each box of cereal. The company wants to see if the amount differs from the stated amount on the box. The stated amount on each box for this particular cereal is 12.5 ounces. The manufacturer takes a random sample of 100 boxes and finds that they average 12.2 ounces with a standard deviation of 3 ounces. Is this a one-tailed or two-tailed significance testing situation?

A)One-tailed with an alternative that the machine fills and average greater than 12.5 ounces

B)One-tailed with an alternative that the machine fills and average less than 12.5 ounces

C)Two-tailed with an alternative that the machine fills and average different from 12.5 ounces

D)Whether it is one-tailed or two-tailed will depend on the p-value

2.A car company is testing to see if the proportion of all adults who prefer blue cars has changed (differs) from 0.35 since industry statistics indicate this proportion has been 0.35 for quite some time. A random sample of 1,000 car owners finds that the proportion that prefers blue cars is 0.40. What is our test statistic value (standardized score)?

A)0.40

B)0.05

c)-3.33

D)+3.33

3.A college admissions website tells potential students that the average amount spent on textbooks is $300.00 per semester. A student group decides to research book cost because it now believes that book cost per semester is greater than $300.00. A random sample of 225 current students finds that the sample average is $324 with a standard deviation of $60. What is our test statistic value (standardized score)?

A)+24

B)+6

C)-6

D)0.4

4.A college admissions website tells potential students that the average amount spent on textbooks is $300.00 per semester. A student group decides to research book cost because it now believes that book cost per semester is greater than $300.00. A random sample of 225 current students finds that the sample average is $324 with a standard deviation of $60. What is the standard error of the mean under the null hypothesis?

A)$60

B)$4

C)$8

D)$15

5.A college admissions website tells potential students that the average amount spent on textbooks is $300.00 per semester. A student group decides to research book cost because it now believes that book cost per semester is greater than $300.00. A random sample of 225 current students finds that the sample average is $324 with a standard deviation of $60. In this situation, the null hypothesis is that:

A)the average for all students is greater than $300

B)the average for all students is greater than $324

C)the average for all students equals $300

D)the average for all students equals $324

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