T-Test Practice

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Answer explanation

This is what your calculator screen should look like. :-)

• T-Test
• Z-Test
• 1-PropZTest

Answer explanation

Your calculator should look like this

In Buenos Aires, the average daily high temperature in a year is reported to be 18.2 degrees Celsius. Catalina believes that last year was warmer than usual. In order to test her belief, she takes a simple random sample of 20 days from last year and records the daily high temperature on each chosen day. She finds that the sample mean temperature is 19.1 degrees Celsius and the sample standard deviation is 7.9 degrees Celsius.

Select the appropriate hypotheses for this test.

In Buenos Aires, the average daily high temperature in a year is reported to be 18.2 degrees Celsius. Catalina believes that last year was warmer than usual. In order to test her belief, she takes a simple random sample of 20 days from last year and records the daily high temperature on each chosen day. She finds that the sample mean temperature is 19.1 degrees Celsius and the sample standard deviation is 7.9 degrees Celsius.

Select the appropriate calculator test.

• T-Test

• Z-Test

• 1-PropZTest

In Buenos Aires, the average daily high temperature in a year is reported to be 18.2 degrees Celsius. Catalina believes that last year was warmer than usual. In order to test her belief, she takes a simple random sample of 20 days from last year and records the daily high temperature on each chosen day. She finds that the sample mean temperature is 19.1 degrees Celsius and the sample standard deviation is 7.9 degrees Celsius.

Select the appropriate p-value for this test.

• .308

• .616

• .692

In Buenos Aires, the average daily high temperature in a year is reported to be 18.2 degrees Celsius. Catalina believes that last year was warmer than usual. In order to test her belief, she takes a simple random sample of 20 days from last year and records the daily high temperature on each chosen day. She finds that the sample mean temperature is 19.1 degrees Celsius and the sample standard deviation is 7.9 degrees Celsius.

If our p-value is .308, how should we conclude?

• Fail to reject Ho.

• Reject Ho.

A website streams movies and television shows to its subscribers. Employees know that the average time a user spends per session on their website is 2 hours. The website changed its design, and they wanted to know if the average session length was longer than 2 hours. They randomly sampled 50 users and found that their session lengths had a mean of 2.75 hours and a standard deviation of 1.55 hours. Select the appropriate hypotheses for this test.

A website streams movies and television shows to its subscribers. Employees know that the average time a user spends per session on their website is 2 hours. The website changed its design, and they wanted to know if the average session length was longer than 2 hours. They randomly sampled 50 users and found that their session lengths had a mean of 2.75 hours and a standard deviation of 1.55 hours.

Select the appropriate calculator test.

• T-Test

• Z-Test

• 1-PropZTest