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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?
This distribution is positively skewed. The standard deviation of the population is not known.
Suppose that you perform a significance test regarding a population mean and that the evidence does not warrant rejection of the null hypothesis.
Using symbols state hypotheses (H 0 and H 1 ) for two-tailed test. Sketch suitable distribution and locate critical region for a = 0.05.
There are 5,000,000 Adults 25+ in Mtown. An advertiser buys a schedule on Channel 45: 20 spots in early news with an average A25+ quarter hour audience of 150,000, 25 spots in daytime with an average A25+ quarter hour audience of 200,000, and 10 s..
One approach would be to contact every psychology graduate student you know and ask them to fill out a questionnaire about it.
Utilizing your charts stated whether the filling operation has been in control for every of the 18 operating hours this day.
The best estimator or appreciative of the population proportion is 0.45. How large must the sample be?
Using Analysis of Variance (ANOVA) test at 5% level if there are important differences in mean sales calls made across the three branches.
Calculate the probability that the median of the sample or average medians is:
Would it be reasonable to conclude that the population distribution is Poisson with a mean of 2.0?
Find the probability of a Type II error if in fact the mean waiting time is actually 9.8 minutes.
Thirty-five fourth-grade students were asked the traditional question "what do you want to be when you grow up? The responses are summarized in the following table:
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