Question

In a study of texting speed, 45 adults aged 18-22 were randomly chosen. Each person was asked to type the following phrase exactly “Hi! What’s up?” on a cell phone. The average time it took was 2.72 seconds. This was found to happen with about a 25% chance when compared to someone saying it takes less than 3 seconds to type.

1.) Identify the following: a. Population: ______________________________________________

b. Sample: _________________________________________________

c. Unit/individual: ___________________________________________

d. Response variable: ________________________________________

2.) What type of variable is the response variable? And what is the level of measurement?

3.) Determine whether the results below appear to have statistical significance, and also determine whether the results have practical significance.

In a study of a hair growth vitamin, 65 subjects grew an average of 1.4 inches of hair in 4 weeks. If regular hair growth is ¼ inch per month. It is found that there is about a 2% chance of getting such results with a diet that has no effect.

i. Does the weight loss program have statistical significance?

ii. Does the weight loss program have practical significance?

Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate for the data below.

4) Alert system of yellow (lowest), orange, and red (highest) right

5) Social security numbers

6) Years in which a war was started

7) Class times measured in minutes

Answer 1