Stated here are some claims or research hypotheses that are to be substantiated by sample data. In each case, identify the null hypothesis and the alternative hypothesis in terms of the population mean μ. Also, classify the hypothesis test as two tailed, left tailed, or right tailed.
a) The mean time a health insurance company takes to pay claims is less than 14 working days.
b) The average person watching a movie at a local multiplex theater spends over $4.50 on refreshments.
c) The mean hospital bill for a birth in the city is less than $5000.
d) The mean time between purchases of a brand of mouthwash by loyal customers is different from 60 days.