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A simple random sample is to be drawn from a population of 1200. To have 90% confidence that the sampling error in estimating p is no more than 0.03, what sample size will be necessary?
Hours worked is important predictor of amount of sales.
Reynolds Electronics accepts a lot from a particular supplier if the defective components in the lot do not exceed 1%. Suppose a random sample of five items from a recent shipment is tested.
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group Perform the chi-square test for a uniform distribution at α = .01
Critically discuss how someone may use measures of central tendency, variation, or position in their home, school, or workplace.
Assume gasoline prices for a region are normally distributed. Do the data you obtained provide enough evidence to reject the claim? Use a 1% level of signi?cance.
Find the minimum sample size needed using a prior study that found that 36% of the respondents said they support abolishing the penny.
What would be the critical value under the null hypothesis if the size of your test were 5%?
These can have a large impact on tenure and promotion decisions at many institutions. One particular instructor had ratings in 3 courses in one semester as given by the table below for the statement "The instructor is an excellent teacher.
Using Non-parametric test, whether there is significant difference in the motor coordination skills.
In a random sample of 53 concrete specimens, the average porosity (in percent) was 21.6 and the standard deviation was 3.2. a) Find a 90% confidence interval for the mean porosity of specimens of this type of concrete.
Find a 96% confidence interval for the true percentage of all households that have central air conditioning. Write a sentence that interprets this interval.
Develop a 90 percent confidence interval for the proportion of applicants that fail the test. (Round your answers to 2 decimal places.)
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