An advertising company wishes to estimate the mean household income for all single working professionals who own a foreign automobile.
If the advertising company wants a 90 confidence interval estimate with a margin of error of 2,500, what sample size is needed if the population standard deviation is known to be 27,500?A) 156
B) 328
C) 251
D) 415
Q. 2If two variables are graphed on the same line chart, two separate scales are always required.
Indicate whether the statement is true or false
Q. 3What is the standard deviation if the proportion of nonconforming items is 0.34, found from 100 samples of size 215?
What will be an ideal response?
Q. 4A frozen food company that makes burritos currently has employees making burritos by hand.
It is considering purchasing equipment to automate the process and wants to determine if the automated process would result in lower variability of burrito weights. It takes a random sample from each process as shown below.Process 1(by hand) Process 2 (automated)n = 10 n = 8s = 0.22 ounces s = 0.16 ouncesIn conducting the hypothesis test, the test statistic is F = 1.375. Indicate whether the statement is true or false
Q. 5What sample size is needed to estimate a population mean within 50 of the true mean value using a confidence level of 95, if the true population variance is known to be 122,500?
A) 211
B) 155
C) 214
D) 189
Q. 6Scatter diagrams can be used for either quantitative or qualitative data.
Indicate whether the statement is true or false
Q. 7Briefly discuss the advantages and disadvantages of using a variable sample size for attributes data.
What will be an ideal response?
Q. 8If a population is not normally distributed, then the sampling distribution for the mean also cannot be normally distributed.
Indicate whether the statement is true or false
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