17. (4 points) Researchers measured the seated syssolic reports -114.9mm ig ands

Question

17. (4 points) Researchers measured the seated syssolic reports -114.9mm ig ands-93m H CGive a bloood pressure of 47 healthy whine males interval for the mean blond peesaure in the population from which the subjects recruited A. (105.6, 124.2) B. (112.2, 117.6) C. (1114, 118.4) D. (112.7, 117.1) E. (114.4, 115.4) 18. (4 points) Assuming an approximately normal (n-30) distribution the standard normal curve can be used for the sampling distribution of sums, and the sampling distribution of the sample mean. A. True B. False 19. (4 points) Suppose we found a correlation coefficient of .81 for the sale of pet monkeys and number of bananas sold. What can we conclude based on this? A. An increase in the sale of pet monkeys causes an inerease in the sale of bananas B. There is no relationship evidenced for these two variables C. A decrease in banana sales is related to an increase in pet monkey sales D. A decrease in banana sales is associated with a decrease in pet monkey sales E. I don't know but monkeys rule! 20. (4 points) Which of the following statements about the RMS (root mean square) is correet? A. It provides a measure of the center (the mean) for a regression B. It provides a measure of accuracy of actual y values in comparison to the regression C. RMS is equal to the correlation coefficient squared D. A low RMS indicates an increase in the distance residuals are from the regression line line E. RMS changes in accordance with slope. An increase in slope means an increase in RMS 21. (4 points) A confidence interval of 99% is associated with a z value of: A. 1.0 B. 2.58 C. 1.96 D. 1.645 E. Depends on the data in the problem

Explanation / Answer

17)

Calculation

M = 114.9
t = 1.64
sM = (9.32/47) = 1.36

= M ± Z(sM)
= 114.9 ± 1.64*1.36
= 114.9 ± 2.231

[112.7, 117.1]

Option D is correct

18) TRUE

19) Option D is correct.

Correlation is positive . so if one variable increase other shuld also increase.

Option A is wrong because correlation does not comment on causation.

21) Z score for 99% confidence interval is 2.58

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