Question

In: Statistics and Probability

1. A null and alternative hypothesis is given. determine whether the hypothesis test is left tailed,...

1. A null and alternative hypothesis is given. determine whether the hypothesis test is left tailed, right-tailed, or two-tailed. Ho: u=37, H1: u>37

2. True or False. The t value for the area in the right tail is 0.02 and n=10 is 2.359

3. write the null and alternative hypothesis. according to a magazine, the mean donation per household in 1998 was $1623. a researcher claims that it has increased since then.

4.the following data are prices for a 4 GB flash memory card at different stores. 12.25, 14.99, 13.49, 16.38, 13.63, 14.95, 14.75, 20.88, 14.21, 20.38. construct a 99% confidence interval to estimate the mean price of a $ GB memory card. use t table

4.

Solutions

Expert Solution

1:

Alternative hypothesis shows that test is right tailed.

Correct option is right tailed.

2:

Degree of freedom:

df = 10-1= 9

The critical value using excel function "=TINV(2 * 0.02, 9)" is 2.398.

Hence, it is false.

3:

4:

Following table shows the calculations for mean and SD:

X (X-mean)^2
12.25 11.162281
14.99 0.361201
13.49 4.414201
16.38 0.622521
13.63 3.845521
14.95 0.410881
14.75 0.707281
20.88 27.973521
14.21 1.907161
20.38 22.934521
Total 155.91 74.33909

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orchestra answered 2 years ago
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