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Two random samples are taken, with each group asked if they support a particular candidate. A summary of the sample sizes and proportions of each group answering yes'' are given below:
Pop. 1:Pop. 2:n1=96,n2=85,p^1=0.797p^2=0.606
Suppose that the data yields (0.0566, 0.3254) for a confidence interval for the difference p1?p2 of the population proportions. What is the confidence level? (Give your answer in terms of percentages.)
Confidence Level = %.
Will the distribution of x bar always be approximately normally distributed, or does it depend on the distribution of the population?
The old equipment? based on the results, does the new equipment appears to be effective in reducing the variation of the weights?
Test the hypothesis that the machines are showing difference qualities of performance. Use 5 per cent level of significance.
question considerthedataset123456789a. obtainthemeanandthemedianofthedata. whatistheshapeofthe distribution?b.
If writing scores for population have standard deviation of s = 20, does sample give sufficient evidence to conclude that new composition course has significant effect? Suppose a two tailed test with a = 0.05.
briefly restate your research area of interesta. identify at least 2 variables for which you would utilize a
Using the original data, estimate the population standard deviation with 90% probability.
q1 the gestation period for human births can be taken as normally distributed with a mean of 266 days and a standard
A Pool Supply sells all types of billiard equipment, and is considering manufacturing their own brand of pool cues. Mysti Farris, the production manager, is currently investigating the production of a standard house pool cue that should be very po..
The contingency table below shows the results of a random sample of 200 state representatives that was conducted to see whether their opinions on a bill are related to their party affiliation
actions to improve the repair time of equipment used to produce electronic components were taken two years ago. the
Standard deviation was $15.50. For 56 Model B ovens, the mean repair cost was $85 and the standard deviation was $30. At alpha=.01, would you buy Model A?
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