In: Math
Which type of t inference procedure?
(A: one sample, B: matched pairs, C: two samples)
1. ______Is blood pressure altered by use of an oral contraceptive? Comparing a sample of women not using an OC with a sample of women taking it.
2. ______Average cholesterol level in general adult population is 175 mg/dl. Take a sample of adults with ‘high cholesterol’ parents. Is the mean cholesterol level higher in this population?
3. ______Does bread lose vitamin with storage? Take a sample of bread loaves and compare vitamin content right after baking and again after 3 days later.
4. ______Does bread lose vitamin with storage? Take a sample of bread loaves just baked and a sample of bread loaves stored for 3 days and compare vitamin content.
One Sample t Test determines whether the sample mean is statistically different from a known or hypothesized population mean
Two-sample t-test is used when the data of two samples are statistically independent
The matched-pair t-test is used when the data from the two groups can be presented in pairs measured in before-and-after comparison or when the group is given two different tests at different times
Using above information, lets classify following
1. ______Is blood pressure altered by use of an oral
contraceptive? Comparing a sample of women not using an OC with a
sample of women taking it.
- In this two different samples are taken one using OC and one not
using OC. Thus, Two-sample t-test is used
2. ______Average cholesterol level in general adult population
is 175 mg/dl. Take a sample of adults with ‘high cholesterol’
parents. Is the mean cholesterol level higher in this
population?
- In this single sample is used to compare with population. Thus,
One Sample t Test is used
3. ______Does bread lose vitamin with storage? Take a sample of
bread loaves and compare vitamin content right after baking and
again after 3 days later.
- In this same bread loaves are compared before and after. Thus,
matched-pair t-test is used
4. ______Does bread lose vitamin with storage? Take a sample of
bread loaves just baked and a sample of bread loaves stored for 3
days and compare vitamin content.
- Here we are considering two different samples. Thus, Two-sample
t-test is used