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A sample of 12 measurements on the tensile strength of steel bars resulted in a mean of 585 N/mm^2 and a standard deviation of 38. Estimate the true mean tensile strength of bars of this size and tyoe using 90% confidence interval. List any assumptions you need to make. Given n=150, x(bar)=477N/mm^2, and s=13.
A public health researcher tested the hypothesis that providing new car buyers with child safety seats will also act as an incentive for parents to take other measures to protect their children
What is the smallest number of consumers that Timex can survey to guarantee a margin of error of .05 or less at a 99% confidence level and calculate the intervals correctly
State the null and alternate hypotheses. Calculate the sample standard deviation. Determine which test statistic is appropriate (chi-square or F), and calculate its value.
They are asked if they use a laptop in class to take notes. Suppose that based on the survey, 220 of the 400 students responded "yes". a) What is the value of the sample proportion ^p ? b) What is the standard error of the sample proportion?
No more than 36% of the monthly gross income. what is the maximum monthly mortgage loan payment for which shawn can be approved?
Using an alpha of .05, what can you conclude about homogeneity of variance from the output? Word process your responses on the SPSS output pages.
The following frequency table lists the sales of an item and the number of times it has occurred. It was obtained from historical records. Sales/Frequency: 10/100, 15/120, 20/300, 25/350, 30/400, 35/500, 40/300, 45/170.
PiggyBank has narrowed its options down to two incentive plans: The bank doesn't know whether consumers would shop online more than at clothing stores.
Data are recorded on effects of each drug. Is research division by using dependent or independent samples? Explain why?
What happens to the Maximum Error of Estimate as the sample size gets larger?
In a study, 37% of adults questioned reported that their health was excellent. A researcher wishes to study the health of people living close to a nuclear power plant.
Use traditional hypothesis test approach. Draw a graph showing the test statistic and critical values. Assume the population has a distribution that is approximately normal and that the sample is a simple random sample.
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