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A random sample of 81 credit sales in a department store showed an average sale of $68.00. From past data, it is known that the standard deviation of the population is $27.00.
a. Determine the standard error of the mean.
b. What is the 95% confidence interval of the population mean?
Four percent of the customers of a store buy cigars. Half of the customers who buy cigars buy beer and one fourth of those who buy beer buy cigars. The table is given below:
Assume that Los Arboles had a special program in place to encourage helmet use. Elucidate to what extent did removal of the outlier improve the fit.
What proportion of time will it take clean-up crew 56 or more hours for cleaning plant? Define the lower and upper limits of interval.
Given that standard deviation process=4.7 and standard deviation gage=3.4, what is the total standard deviation in data from this process?
For the most recent year available, the mean annual cost to attend a private university in the United States was $20,182. Assume the distribution of annual costs follows the normal probability distribution and the standard deviation is $4,400.
The Appliance Center has six sales representatives at their North Jacksonville outlet. Listed below is the number of refrigerators sold by each last month.
What is the 95% confidence interval for the mean number of microwaves sold at a retail store in the chain last week?
The resistances of carbon resistors of 1500 ohm nominal value are normally distributed with µ = 1500 and standard deviation = 200. What proportion of resistors is expected to have resistance greater than 1150 ohm?
Compute the effect size for each of the following average SAT math scores. Remember SAT math is standardized such that u= 500 and standard deviation =100.
National average for 2-year leases is 30,000 miles. Select the suitable hypothesis.
Employees of a local university have been classified according to gender and job type. The following table provides data about the employees.
If you arbitrarily grab 2 socks out of drawer determine the probability that you grab a matching pair?
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