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According to study the mean number of apps downloaded by iphone users is 70. A random...

According to study the mean number of apps downloaded by iphone users is 70. A random sample of 36 iphone users downloaded an average of 65 apps with a standard deviation of 25.we speculate the claim to be made.
(SHOW ALL work)

1.) What is the Null and Alternative hypothesis? for the avarge number of apps downloaded

2.) Are the conditions above satisfied? Explain?

3.) Caculate the test stastic?

4.) What is the P-vaule?

5.) Write the final conclusion at at 5% signifcance level?

6.) If a 95% confidence interval for the true mean of apps was downloaded by iphone users , will 70 be inside or out the confidence interval?

Math   Statistics-And-Probability   
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