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Your manager, who just read an abridged version of a statistics book, wants you to test hypotheses for the difference in two population means. The sample sizes for each are 23. He is adamant that you perform a z-test. What would you tell him? What specific explanation would you give?
It was reported that approximately 45% of all university professors are extroverted. Suppose you have classes with 6 different professors.
Find the percent of a standard Normal model found in the given region. Round to the nearest hundredth of a percent.
A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?
Can we conclude from this that most workers there earn between $25 and $35 per hour? Is this the right interpretation for the margin of error?
Let's suppose that we have 2 variables year and age.. I use STATA to make them into dummy variables as follows:
Find the questions based on multiple regression - The coefficient of determination for the above model is approximately
A random sample is selected from a normal population. The population mean is 60 and the standard deviation is 15. after treatment the sample mean is 65. the sample size is 25.
Bruce Kuhlman, owner of Kuhlman Farms, wishes to use brand of fertilizer which will produce maximum yield per acre of wheat. Mr. Kuhlman can select from four different commercial brands. Write down the hypotheses?
Can we conclude that the mean time for a game is less than 3.50 hours? Use the .05 significance level.
Which of the following statements is true regarding a nonparametric test? We assume that the data has been chosen from a normally distributed population
Apply the EOQ model to the following quantity discount situation in which D=500 units per year, C0=$40, and the annual holding cost rate is 20%. What order quantity do you recommend?
How many degrees of freedom should the researcher use in her t-test critical value assuming that the variances are equal?
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