Question

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 20 Saturday mornings during the past year and determines the sample mean is 4.5 and the sample standard deviation is 1.4. It can be assumed that the population is normally distributed. The level of significance is 0.01. The decision rule for this problem is to reject the null hypothesis if the observed "t" value is _______. Group of answer choices less than -2.120 or greater than 2.120 less than -3.120 or greater than 3.120 less than -2.861 or greater than 2.861 less than -1.761 or greater than 1.761 less than -2.753 or greater than 1.753

          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 20 Saturday mornings during the past year
and determines the sample mean is 4.5 and the sample standard
deviation is 1.4.  It can be assumed that the population is
normally distributed.  The level of significance is
0.01.  The decision rule for this problem is to reject the
null hypothesis if the observed "t" value is _______.
Group of answer choices
less than -2.120 or greater than 2.120
less than -3.120 or greater than 3.120
less than -2.861 or greater than 2.861
less than -1.761 or greater than 1.761
less than -2.753 or greater than 1.753

Added by Brian A.

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