You may need to use the appropriate appendix table or technology to answer this question. A simple random sample of 40 items resulted in a sample mean of 25. The population standard deviation is o = 8. (Round your answers to two decimal places.) (a) What is the standard error of the mean, o-? 8 (b) At 95% confidence, what is the margin of error? Need Help? Read It
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- please give answer for 10, 11, and 1219 The mean of z-scores in a data set a is zero only when the x-values are balanced around the mean of x. b is greater than zero for data sets that have large outlying values. c is always equal to one. d is always equal to zero24 John works in an appliance store. His sales commission depends on the number of units sold per period, and the overall average price of all units sold. The following is a report of his sales effort in a given month. The report shows the price and the percent of total units sold at that price. Percent of total units Item Price sold A $1,640 10% B 1270 25% C 860 35% D 460 20% E 200 10% The overall mean price of all items sold is, a $930.64 b $912.39 c $894.50 d $876.96
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