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Marian P.
Tutor for Business, Business Research, and Statistics
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Economics
TutorMe
Question:

Keep in mind the rule of 70. The population of a town is growing by 4% per year. How long will it take the population to double?

Marian P.
Answer:

70/4 = 17.5. The population of the town will double in 17 and a half years.

Statistics
TutorMe
Question:

Two groups of high-school students are being studied. One group is regularly attending study skills workshops, and the other is not. The two groups' GPAs are compared using a paired-sample t-test with an alpha level of .05. The test returns a p-value of .002. State the two-tailed and one-tailed hypotheses and interpret the p-value.

Marian P.
Answer:

Ho: There will be no difference between the GPAs of the group that attended the workshops and the GPAs of the group that did not attend the workshops. Ha (two-tailed): There will be a difference between the GPAs of the group that attended the workshops and the GPAs of the group that did not attend the workshops. Ha (one-tailed): The GPAs of the group that attended the workshops will be higher than the GPAs of the group that did not attend the workshop. Because the p-value is less than the alpha level, the null hypothesis can be rejected. For a two-tailed test, it can be concluded that there is a statistically significant difference in the GPAs of the group that attended the workshops and the GPAs of the group that did not. For a one-tailed test, it can be concluded that the GPAs of the group that attended the workshops are statistically significantly higher than the GPA of those that did not.

Data Science
TutorMe
Question:

State a situation in which running a multiple regression would be appropriate.

Marian P.
Answer:

A client would like to know which aspects of his different advertisements are most effective. A multiple regression can be run using his advertisements' effectiveness, analyzing them to find out if celebrity sponsorship, certain jingles, or emotional appeals are driving consumer purchasing the most.

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