A manager at a local company asked his employees how many times they had given blood in the last year. The results of the survey are given below.
The random variable x represents the number of times a person gave blood and P(x) represents the probability of selecting an employee who had given blood that percent of the time. What is the standard deviation for the number of times a person gave blood based on this survey?
x 0 1 2 3 4 5 6
P(x) 0.30 0.25 0.20 0.12 0.07 0.04 0.02
A) 2.23 B) 1.82 C) 1.16 D) 1.54
Question 2
A nutritionist wants to investigate whether her new diet will be effective in helping women aged 30-40 to lose weight.
She will use a paired sample to determine whether the mean weight of women before going on this diet is greater than the mean weight of women after being on this diet for two months. Identify the paired-difference variable for the proposed hypothesis test.
A) Difference between mean weight of women aged 30-40 who are not on this diet and mean weight of women aged 30-40 who have been on this diet for two months.
B) Difference between weight of a randomly selected woman aged 30-40 who is not on this diet and weight of a randomly selected woman aged 30-40 who has been on this diet for two months.
C) Difference between weight of a woman aged 30-40 before going on this diet and weight of same woman after being on this diet for two months.
D) Difference between weight of a woman aged 30-40 after being on this diet for two months and weight of her husband after being on this diet for two months.
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