6. Researchers want to test whether the average writing scores from the particip
ID: 3133400 • Letter: 6
Question
6. Researchers want to test whether the average writing scores from the participants differ significantly from a midpoint value of 50. It is assumed the test variable “write” is normally distributed in the population; the cases represent a random sample from the population, and the scores on the test variable are independent of each other.
7. - Researchers wish to test the effect of using a lumbar support pillow on angular position of the pelvis in relaxed sitting. The researchers non-directional hypothesis is that pelvic tilt will change with use of a support pillow. They choose 40 participants and the angle of the pelvic tilt is measured with and without the pillow. The data is assumed to be normally distributed.
8. - A medical researcher wishes to see whether the variance of the heart rates (in beats per minute) of smokers is different from the variance of heart rates of people who do not smoke. The assumptions are that the populations from which the samples were obtained are normally distributed; and the two samples are independent of each other.
- 9. Infant BP’s were collected during the first few days of life in the newborn nursery and again at one week, 1 month, 6 months, 12 months, 18 months, 24 months. The following question was asked at 6 months of life: Do you add salt to the baby food? The mean SBPs of the infants were obtained in the subgroups of mothers:
Do you add salt to the baby food?
Mean SBP
sd
n
Yes
95.0
13.0
23
No
91.3
9.5
503
10. Health professionals want to investigate the medium-term effect of a hypnotherapy program on the daily cigarette use of heavy smokers. In particular, they are interested in assessing whether cigarette consumption is lower 6 months after the hypnotherapy program compared to pre-hypnotherapy). The following research question and null hypothesis were posed:
Research question
Is there a difference in daily cigarette use amongst heavy smokers 6 months after a hypnotherapy program?
Null hypothesis
There is no difference in daily cigarette use amongst heavy smokers 6 months after a hypnotherapy program.
It is assumed that a) data are paired and come from the same population; each pair is chosen randomly and independently; c) the dependent variable is a continuous or ordinal.
USE ONLY 1 TEST FOR EACH QUESTION. THANKS!
ONE SAMPLE T-TEST, ONE SAMPLE WILCOXON SIGNED-RANKED TEST, MCNEMAR TEST, TWO SAMPLES T-TEST FOR INDEPENDENT MEANS WITH EQUAL VARIANCES,
PAIRED SAMPLES T-TEST, F-TEST, MANN-WHITNEY U TEST, CHI-SQUARE TEST, PAIRED SAMPLE WILCOXON SIGNED RANKED TEST, AND TWO SAMPLES T TEST FOR INDEPENDENT MEANS WITH UNEQUAL VARIANCES
Do you add salt to the baby food?
Mean SBP
sd
n
Yes
95.0
13.0
23
No
91.3
9.5
503
Explanation / Answer
6. ONE SAMPLE T-TEST because sample mean is compared with population mean.
7. PAIRED SAMPLES T-TEST because sample is paired.
8. F-TEST because F test is used ti test two variances when population is normally distributed.
9. TWO SAMPLES T TEST FOR INDEPENDENT MEANS WITH UNEQUAL VARIANCES because we want to compare two means and populations are normally distributed.
10. PAIRED SAMPLES T-TEST because sample is paired.
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