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A bin of 1000 turnbuckles has an unknown number D of defectives. A sample of 100 turnbuckles has 2 defectives. The maximum likelihood estimate for D is the number of defectives which gives the highest probability for obtaining the number of defectives observed in the sample. Guess this number D and then write a computer program to verify your guess.
You have ordered 10 bags of cement, which are supposed to weigh 94 kg each. The average weight of the 10 bags is 93.5 kg. Calculate the condence interval in R, and write the code you used
Suppose adults have basically distributed IQ scores with a mean of 100 and an SD of 15. Find P65, the 65th percentile. Use the Z table.
Speaking to a group of analysts in January 2006, a brokerage firm executive claimed that at least 70% of investors are currently confident of meeting their investment objectives.
A local Junior High principal has decided to give an award to any student who scores in the top 15% of statewide scores. How high should a student score be to win this award?
1. Let X1,..., Xn be a random sample from a normal population. A particular realization resulted in a sample mean of 20 with the sample standard deviation 4. Construct a 95% con?dence interval for μ when:
A survey of 85 families showed that 36 owned at least one DVD player. Find the 99% confidence interval estimate of the true proportion of families who own at least on DVD player.
The expected peak expiratory flow rate in adults is 300 with a standard deviation of 50. how many subjects should be enrolled to ensure 80% power to detect a difference of 15 liters per minute with a two-sided test and significance level of 0.05?
Using the z table in Table E of Appendix C, determine the critical value for the hightailed test with a = 0.035.
State the decision rule. Compute the value of the test statistic. What is your decision regarding the null hypothesis?
Identify the independent variable and the dependent variable for this experiment. Sketch a polygon showing the frequency distribution for the humurous sentences. In the same graph, sketch a polygon for the nonhumurous sentences. Does it appear that..
Generate a testable null statistical hypothesis and an alternative statistical hypothesis. Select an alpha level of .05, .01, or .001 and justify your choice.
The price in dollars of a gallon of gasoline at the end of each month is recorded for one year.
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