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

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Definitions:

Adulthood

The life stage characterized by full physical development and maturity, including the assumption of responsibilities and roles typical for grown individuals.

Seattle Longitudinal Study

A long-term study that began in 1956, focusing on the cognitive abilities of adults as they age, providing valuable insights into the process of cognitive aging.

Schaie's Analysis

A study or series of studies by developmental psychologist K. Warner Schaie on cognitive development across the lifespan.

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