For the following situations, tell what testing distribution you should use. (normal distribution, t-distribution, chi-square or...
For the following situations, tell what testing distribution you should use. (normal distribution, t-distribution, chi-square or ANOVA).
a. A simple random sample of adults is obtained and the sample mean red blood cell count is measured. Assuming we know the population standard deviation, test the claim that the sample is from a population with a mean less than 5.4 cells/mL.
b. A study of the flammability of children’s sleepwear across five different laboratories was done. Test the claim that the means for the different laboratories are all the same.
c. A study was conducted to estimate hospital costs for accident victims who wore seat belts. The randomly selected cases have a distribution that appears normal. We do not know the population standard deviation. Test the claim that the population of all victims who wore seat belts has a mean equal to $9004.
d. A study of high school students at least 16 years of age asked the students whether they drove when drinking alcohol and texted while driving. Test the claim of independence between texting while driving and driving when drinking alcohol.
Homework Answers
a)
normal distribution (since sample mean is compared to population mean and population standard deviaiton is known)
b)
ANOVA (since there are more than 2 groups are being comapred)
c)
t-distribution (since sample mean is compared to population mean and population standard deviaiton is unknown)
d)chi-square (snce association between categorical variables are checked)
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