The Local Oil Changing Business Is Very Busy on Saturday

question 121

Multiple Choice

The local oil changing business is very busy on Saturday mornings and is considering expanding.A national study of similar businesses reported the mean number of customers waiting to have their oil changed on Saturday morning is 3.6.Suppose the local oil changing business owner, wants to perform a hypothesis test.The null hypothesis is the population mean is 3.6 and the alternative hypothesis is the population mean is not equal to 3.6.The owner takes a random sample of 16 Saturday mornings during the past year and determines the sample mean is 4.2 and the sample standard deviation is 1.4.It can be assumed that the population is normally distributed.The level of significance is 0.05.The decision rule for this problem is to reject the null hypothesis if the observed "t" value is _______.

• A)less than -2.131 or greater than 2.131
• B)less than -1.761 or greater than 1.761
• C)less than -1.753 or greater than 1.753
• D)less than -2.120 or greater than 2.120
• E)less than -3.120 or greater than 3.120

---

Definitions:

Tariffs

Taxes imposed by a government on imported goods.

Imported Oil

Oil that is brought into a country from another, typically used as a critical input for energy production and transportation.

Tariff

A tax imposed by a government on goods and services imported from other countries to increase their price and encourage or protect domestic industry.

Imported Oil

Oil that is bought from foreign countries to meet domestic consumption demands.