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[1 125% v .5 EE! 01 m 1... v View Zoom Add Page Insert Table Chart Text Shape Media Comment uestion 3: 4 points .2

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[1 125% v .5 EE! 01 m 1... v View Zoom Add Page Insert Table Chart Text Shape Media Comment uestion 3: 4 points .2 marketing researcher wants to estimate the mean amount spent ($) on Amazon-com by Amazon Prime member shoppers. Suppose a random sample of 100 Amazon Prime member shoppers who recently made a purchase on Amazon.com yielded a mean amount spent of $1,500 and a standard deviation of $200. 1. Using a 0.05 level of signicance, state your decision. ' 2. Using the critical value approach, is there evidence that the population mean amount spent on Amazon.com by Amazon Prime member shoppers l5 less than $1,475? . 3. Determine the p-value and interpret its meaning. Question 4: 5 points The population mean waiting time to check out of a supermarket has been 4 minutes. Recently, in an effort to reduce the waiting time, the supermarket has experimented with a system in which infrared cameras use body heat and in-store software to determine how many lines should be opened. A sample of 100 customers was selected, and their mean waiting time to check out was 4.25 minutes with a sample standard deviatthn of 2.7 minutes. 1. State your decision rule. 2. What is your decision? 3. At 0.05 level of signicance, using the critical value approach, is there evidence that the population mean waiting time to check out is greater than 4 minutes? 4. Determine p-value and interpret its meaning. Question 5: 4 points A cellphone provider has the business objective of wanting to determine the proportion of subscribers who would upgrade to a new cellphone with improved features if it were made available at a substantially reduced price. Data are collected from a random sample of 550 subscribers, and the result indicate that 150 of the subscribers would upgrade to a new cellphone at reduced cost. 1. State the null and alternative hypotheses. Observe the proper format. 2. At 0.05 level of signicance, state your decision. 3 . Is there evidence that more that 20% of the customers would upgrade to a new cellphone at a reduced cost

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