Question

1)A research study of 15 children with a diagnosis of ADHD wish to assess whether the BMI of the children is correlated with degrees of hyperactivity in the child. The BMI of the 15 children in a study: 22, 23, 25, 24, 18, 27, 26, 29, 28, 31, 32, 28, 33, 28, 34. What is the 75th quartile of BMI of the children?

a. 28

b. 30

c. 34

d. 27

2)

A research study examined the cholesterol levels in two groups, intervention versus placebo, to see whether consuming more salmon in the diet would make a difference on cholesterol levels. The mean cholesterol level of the 60 people in the placebo group was 240 with a SD of 20. The 60 people in the salmon consumption group had a mean cholesterol level of 210 with a SD of 21. Calculate the z, t, or chi-square test and choose the value in the answer below.

Select one:

a. 6.91

b. 7.23

c. 8.01

d. 5.38

Answer 1

1). arranging the data in increasing order we get:-

18,22,23,24,25,26,27,28,28,28,29,31,32,33,34

here, total number of observation (N) = 15

so 75 th quartile

it means the observation in between 11 th and 12 th observation = 30

so,

the 75th quartile of BMI of the children = 30 ( B)

2). we will calculate t statistic.

given data,

the test statistic:-

the t statistic = 8.01(C).

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