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The 95% confidence Interval for one population mean.
1. A study at a college in the west coast reveals that, historically, 45% of their students are minority students. If random samples of size 75 are selected, 80% of the samples will have less than ______% of minority students.
2. A major department store chain is interested in estimating the average amount its credit card customers spent on their first visit to the chain's new store in the mall. Fifteen credit card accounts were randomly sampled and analyzed with the following results= $50.50 and s2 = 400. Construct a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall assuming that the amount spent follows a normal distribution.
1. $50.50 ± $9.09
2. $50.50 ± $10.12
3. $50.50 ± $11.00
4. $50.50 ± $11.08
Calculate the value of chi-square. What is your decision regarding H 0 ?
Do the data provide significant support for any preferences among the three brands? Test At the .05 level of significance.
There are three flight phases. At α = 0.05, is the cockpit noise level independent of flight phase?
How large a sample should be taken if the desired margin of error is?
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The researcher found that Lincoln's educational score did not correlate with the expected variables.
At 0.01 significance level is it sensible to conclude that modification reduced number of traffic accidents?
How large should n be so that a 90% confidence interval for µ has a margin of error and What is the P-value for a test of the hypotheses
What type of error would result in that case? Respond to at least two of your classmate's postings.
One measure of the overall sampling error in the entire distribution of sample means is the
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
What is the probability that the average IQ, from a random sample of 64 individuals, is greater than 102?
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