The 1 population t-test for the mean has an underlying assumption of normality =

Question

The 1 population t-test for the mean has an underlying assumption of normality = TRUE

True
False


Question 2
You test the null hypothesis that a drug is not toxic to mice. Theoretically a Type I error would result in:

mice die
mice don't die

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Question 3
You only have a statistically significant result if you reject the null hypothesis.

True
False


Question 4
The t distribution is always symmetric around a value of zero

True
False


Question 5
You survey 300 people and find out that 75 of them have been to a concert in the last year. You want to compare this to the 10% value known for the US population. What test will you use

a one population t-test for the mean
a one population z-test for the mean
a one population z-test for the percent


Question 6 Tests about percents still have an assumption of normality

True
False

Explanation / Answer

1) True as it is approximately normally distributed

2) mice die as drug is toxic to mice

3) True if we reject the null hypothesis resultis significant

4) True random variable for t test has a standard normal distribution (i.e. normal with expected value 0 and variance 1)

5) a one population z-test for the mean

6) True (approximately normal)

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