Question

Write the null and alternative hypotheses. Determine whether the hypothesis test is left -tailed, right- tailed, or two-tailed and the parameter that is being tested. The standard deviation of the average repair bill is generally $35. A researcher believes it is greater than that now. a. Null Hypothesis: b. Alternative Hypothesis: c. Parameter: d. Type of test:

Answer 1

a. Null hypothesis :$\sigma = 35$

b. Alternative Hypothesis: $\sigma >35$

c. Parameter: Standard deviation

d. Type of test: Chi square test

This is right tailed test, we need to check if the standard deviation is greater than 35