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An appliance manufacturer claims to have developed a new toaster oven that consumes an average of no more than 250 W. From previous studies, it is believed that power consumption for toaster ovens is normally distributed with a variance of 324 W. A consumer group suspects the actual average is more than 250 W. They take a sample of 20 toaster ovens and calculate the average consumption to be 260 W. What is the parameter of interest in this situation? And test the consumer group's suspicion at the 5% significance level.
Find the probability between the given values for normal distribution.
University officials at a major university would like to use three -term moving averages to examine enrollment. Enrollment data (in thousands of students) for the 12 most recent terms are shown in middle column of the table below.
Jeweller desires to know how many of each item to make each week to maximize profit. Create the integer programming model for this problem (written in format similar to way Problems 1 and 2 were presented).
Make a point estimate and a 95% confidence interval estimate.
Determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.
The following frequency distribution was obtained. The data values are in hours. Construct a histogram for the data .
Calculate the value of chi-square. What is your decision regarding H 0 ?
At the .05 significance level, can we conclude that there is a difference in their mean times?
At times we can generate a regression equation to explain outcomes. For example, an employee's salary can often be explained by their pay grade, appraisal rating, education level, etc.
Use a 95% confidence interval for multiple comparisons. Show your calculation by hand between Monday and Tuesday. Match your answer with Minitab output. Attach Minitab output.
What is the probability of randomly selecting a student with a treadmill time greater than 25 minutes? In symbols, p(X>25)= ? What is the probability of randomly selecting a student with a time greater than 30 minutes? In symbols, p(x>30) ?
Which of the following statements isn't a property of the normal probability distribution? Please explain briefly why
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