# Hypothesis Testing of Internet Provides and Disc Players

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QUIZ TWO

DUE DAY SEVEN OF WEEK THREE

PROBLEM TWO (Ten Points):

PROBLEM THREE (Ten Points):

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The solution addresses the following:

There are two major internet providers in the Colorado Springs area.....

The manufacturer of a compact disc player wanted to know whether a 10 percent reduction......

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Please see attachment

QUIZ TWO

DUE DAY SEVEN OF WEEK THREE

PROBLEM TWO (Ten Points):

Solution. Denote the percent of time that access to HTC by and denote the percent of time that access to Mountain by . Then the appropriate hypotheses are

The estimates of and are

are sample sizes. We can compute that

We use Z-test, so the test statistic is

If is true, then follows roughly the standard normal distribution. The test stat0stic has the value

Under 0.01 significance level, ...

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- BSc , Wuhan Univ. China
- MA, Shandong Univ.

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- "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
- "excellent work"
- "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
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