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We have provided summary statistics for independent simple random samples from two populations. Preliminary data analyses indicate that the variable under consideration is normally distributed on each population. Decide, in each case, whether use of the pooled t-test and pooled t-interval procedure is reasonable. Explain your answer.
x?1=39.04, s1=18.82,n1=51,x?2=49.92,s2=18.97,n2=53.
Estimating the individual score using normal distribution and find the minimum SAT score needed to be accepted?
Has there been a significant decrease in the proportion of students who change their major after the first year in this program? Test at the .05 level of significance.
Fawns Fawns among1 or 5 months old in Mesa Verde National Park have a body weight that is approximately normally distributed with mean
How many more days should be included in the sample to be 95% sure the population mean μ is within $50 of the sample mean x?
a discrete random variable can be described as binomial distribution if is satisfies four conditions briefly discuss
Jon Molnar will graduate from Carolina Forest High School this year. He took the American College Test (ACT) for college admission and received a score of 30.
Estimate the population mean
The response time for Denver police to respond to emergency calls is 8.4 minutes with a standard deviation 1.7 find the probability that the response time for a call between 5 and 10 minutes.
questionthe following artificial data record the length of stay in days spent on a psychiatric ward for 28
A population consists of ten items, six of which are defective. In a sample of three items, what is the probability that exactly two are defective?
What is the null hypothesis in a chi-squared test of independence? How many 'tails' can a chi-squared test have, one or two? In a regression analysis, what do the residuals from the fitted line add up to?
testing the difference between two means.bull what two assumptions must be met when you are using the z test to test
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