A parenting magazine reports that the average amount of wireless data used by teenagers each month is 7 Gb. For her science fair project, Ella sets out to prove the magazine wrong. She claims that the mean among teenagers in her area is less than reported. Ella collects information from a simple random sample of 25 teenagers at her high school, and calculates a mean of 6.5 Gb per month with a standard deviation of 1.8 Gb per month. Assume that the population distribution is approximately normal. Test Ella's claim at the 0.01 level of significance. Step 2 of 3: Compute the value of the test statistic. Round your answer to three decimal places.

Why does the use of multiple t tests increases?

A sample of 900 computer chips revealed that 68% of the chips fell in the first 1000 hours of their use. The companies promotional literature states that 67% of the chips fail in the first 1000 hours of their use. The quality control manager wants to test the claim that the actual percentage that fail is different from the stated percentage. Find the value of the test statistic. Round your answer to two decimals.

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topic is Hypothesis test for proportions. I already answered most of the question. Please help me fill the rest. Thanks

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Carmen and Rosanna are two employees in an electronics store. The store manager has put an emphasis on increasing the number of applications for the store credit card. The manager randomly selected 24 weeks for each employee and recorded the number of completed applications for each week, which is provided in the samples below. Each employee completed 21 applications in one of the weeks selected. Use Excel to calculate each employee's z-score for completing 21 applications. Round your answers to two decimal places. Carmen Rosanna11 56 1115 613 185 1114 1416 521 208 1110 97 1416 1513 1310 619 2118 95 1817 310 126 1712 1214 419 1017 8

Use the expression in the accompanying discussion of sample size to find the size of each sample if you want to estimate the difference between proportions of men and women who own smartphones. Assume that you want 95​% confidence that your error is no more than 0.03.

Test whether males are less likely than females to support a ballot initiative, if 23% of a random sample of 50 males plan to vote yes on the initiative and 32% of a random sample of 50 females plan to vote yes.

You are testing the claim that the proportion of men who own cats is smaller than the proportion of women who own cats.You sample 90 men, and 80% own cats.You sample 110 women, and 70% own cats. test statistic =      [three decimal accuracy]