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A study has indicated that the sample size necessary to estimate the average electricity use by residential customers of a large western utility company is 900 customers. Assuming that the margin of error associated with the estimate will be ±30 watts and the confidence level is stated to be 90 percent, what was the value for the population standard deviation?
what is the difference between significance level and a p-value? explain in
If two variables are strongly correlated, does it necessarily always follow that there is a direct cause-and-effect relationship between the two variables?
a national grocers magazine reports the typical shopper spends six minutes in line waiting to check out. a sample of 16
In a study, 65 % of the 100 Republicans surveyed, favored the bill for a salary increase and 60 %of the 200 Democrats surveyed, favored the same bill for a salary increase. Test whether the proportions of Republicans and Democrats favoring this bi..
A statistical study reported that a drug was effective with a p-value of .042. Explain in words what this tells you.
What characterizes a regular definition (dictionary) and an operational definition? What is the purpose of sampling?
q1. a research shows that employee salaries at company xyx in thousands of dollars are given by the equation y-hat 48.5
Any state auto insurance company took a random sample of 370 insurance claims paid out during a 1-year period. the average claim was $750 with a standard deviation of $150. find .99 confidence interval for the mean claim payment.
Use Friedman test to find out whether there is evidence for significant difference between two population variance. Use .05 level of significance.
At the 5% level of significance, would we reject the null hypothesis that the mean breaking load is 510 pounds or more?
Use the following frequency distribution to determine the midpoint of the second class.
questiona manufacturer of squash racquets has collected information on time in months to breakage for their racquets
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