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1) A sample of 18 widgets has a mean of 57.100 and standard deviation of 7.350. At 99% confidence, the upper limit with 3 decimal places is
2) A statistics course has 20 students in which 71% passed. At 95% confidence, the upper confidence limit for the proportion students passing with 3 decimal places is
3) A statistics course has 22 students in which 83.0% passed. At 90% confidence, the lower confidence limit for the proportion students passing with 3 decimal places is
There are n people eligible to vote in a certain election. Voting requires registration. Decisions are made independently.
Levels of employee motivation in his organization are dropping leading to drop in employee productivity. Draft a research proposal to identify the problem and suggest a methodology for recommending a solution.
AVX Stereo Equipment, Inc recently began a "no hassles" return policy. A sample of 500 customers who had recently returned items showed 400 thought the policy was fair, 32 thought it took too long to complete the transaction, and the rest had no o..
A political strategists believes that less than 55% of voters in a certain state support a particular issue. He then commission s a poll of 500 voters and 54% of them support this issue. If a = .05, is the political strategist's belief warranted
Compute (by hand) the N, Mean, Standard Deviation, Confidence Interval, and Z score for the variables "company market rate" and "accounting rate" respectively in the AccRet.txt dataset
1.A research study that examines the mean number of pounds loss in a weight loss clinic.
The company will replace any printer that fails within 1 year after purchase. What percent of printers can be excpected to fail during the warranty period.
Teaching Sociology (July 1995) developed a model for i the professional socialization of graduate students working toward their doctorate. One of the dependent variables modeled was professional confidence.
The standard deviation was $6050. Is there evidence at the 1% significance level that the cost of attendance has increased? State the hypothesis?
a. conduct a simple linear regression analysis of these data in which the average tuition for private colleges is
If the decision to incur the high additional programming cost was to be made if p > 0.90, was the right decision made (when Eidos went ahead with the ponytail)?
It is seen that the more the system owner spends on preemptive activities, the less the owner spends on after-the-fact activities. Develop and plot a statistical model to relate the two expenditure items. From the developed model, establish and pl..
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