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Q1) Lengths of alligators in certain population of alligators has a standard deviation of σ = 1.6. This population is not normally distributed. You choose a random sample of 64 alligators. Sample mean that you compute is: x‾ = 15.82. Determine a 95% confidence interval for the population mean, µ
Q2) You want to study proportion of individuals in Statville that are left-handed. You choose a random sample of 400 people and number of left=handed people in your sample is 48. Calculate sample proportion and then also calculate a 99% confidence interval for true population proportion, p.
Given the following data, calculate the EMV for each investment alternative. Which is best based on the EMVs you calculated?
Find out the probbility that exactly five arrive within two days?
If true explain and if false give an example. a. The significance level of a statistical test is equal to the probability that the null hypothesis is true. b. If the significance level of a test is decreased, the power of the test would be expected t..
Suppose we wish to test the null hypothesis that there are no differences among the proportion of men and women who developed a rash. Evaluate the P-value of the chi-square test of this hypothesis.
The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is
Which of the following is true about the expected value of perfect information. It is the amount you would pay for any sample study.
They find that these 100 people lost an average of 38 hours with a standard deviation of 9.5 hours. What is the P-value for this significance test?
Explain the difference between a discrete and a continuous random variable. Give two examples of each type of random variable.
Recognize the kind of sampling (random, systematic, convenience, stratified, cluster) employed whenever a sample of people who smoke is obtained as explained below.
The population of IQ scores forms a normal distribution with mean of μ = 100 and a standard deviation of σ = 15. What is the probability of obtaining a sample mean greater than M = 105,
The mean time to download an Google video is 1 minute 30 seconds. Suppose the download time is normally distributed with standard deviation of 20 seconds.
Construct a 95 percent confidence interval for the true mean.
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