Telephone Calls A researcher knew that before cell phones, a person made on average 2.9 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 3.1. At =α0.10, is there enough evidence to support the researcher's claim? The standard deviation for the population found by a previous study is 0.7. Assume that the variable is normally distributed. Use the critical value method with tables. State the hypotheses and identify the claim with the correct hypothesis.
Telephone Calls A researcher knew that before cell phones, a person made on average 2.9 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 3.1. At =α0.10, is there enough evidence to support the researcher's claim? The standard deviation for the population found by a previous study is 0.7. Assume that the variable is
State the hypotheses and identify the claim with the correct hypothesis.
This hypothesis test is a ▼one-tailed test.
Find the critical value(s). Round the answer to two decimal places. If there is more than one critical value, separate them with commas.
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Critical value(s):
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