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Compute the test value. Always round z score values to at least two decimal places. Z= X

Compute the test value. Always round z score values to at least two decimal places. Z= X

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.1: Measures Of Center
Problem 4GP
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Question
8
Telephone Calls A researcher knew that before cell phones, a person made on average 3.2 calls per day. He believes that the number of calls made per day today is higher. He selects a random sample of 28 individuals who use a cell phone and asks them to keep track of the number of calls that they made on a certain day. The mean was 3.5. At a = 0.01, is there enough evidence to support the researcher's claim? The standard deviation for the population found by a previous study is 0.9. Assume that the variable is normally distributed. Use the P-value method with tables. Part 1 of 5 State the hypotheses and identify the claim. Hou = 3.2 not claim Hu>3.2 claim The hypothesis test is a one-tailed ▼ test. Part: 1/5 Part 2 of 5 Compute the test value. Always round z score values to at least two decimal places. Z= ▼ X S
Transcribed Image Text:Telephone Calls A researcher knew that before cell phones, a person made on average 3.2 calls per day. He believes that the number of calls made per day today is higher. He selects a random sample of 28 individuals who use a cell phone and asks them to keep track of the number of calls that they made on a certain day. The mean was 3.5. At a = 0.01, is there enough evidence to support the researcher's claim? The standard deviation for the population found by a previous study is 0.9. Assume that the variable is normally distributed. Use the P-value method with tables. Part 1 of 5 State the hypotheses and identify the claim. Hou = 3.2 not claim Hu>3.2 claim The hypothesis test is a one-tailed ▼ test. Part: 1/5 Part 2 of 5 Compute the test value. Always round z score values to at least two decimal places. Z= ▼ X S
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