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In a sample of 1200 police officers, the mean annual salary was $33,000 and the standard deviation was $3200. A random sample of size 70 is drawn from this population. What is the probability that the mean annual salary is between $32,000 and $32,500?
Following are the data collected. Should the head of the Bureau be concerned about the time taken at lunch by employees? Why?
Determine the probability that their SAT scores will differ by more than 50 points?
What is the estimated standard error of the sample mean? Construct a 95 percent confidence interval for the population mean category fluency test score.
A researcher wishes to forcast the proportion of fish in a perticular lake which is inedible due to pollution of the lake.
(a) Use the steps of hypothesis testing, (b) figure the effect size for the study; and (c) explain your answers to (a) and (b) to someone who has never had a course in statistics.
The critical value of F at 95% confidence when there is a sample size of 21 for the sample with the smaller variance, and there is a sample size of 9 for the sample with the larger sample variance is:
Dunn Poitiac has compiled the following sales data regarding the number of cars sold over the past 60n selling days. Answer the following questions for the sales data shown.
Sales manager wishes to award sales representatives who earn the largest commissions a bonus of= $1,000 .He can award bonus to 20% of representatives. Determine cutoff point between those who earn bonus and those who don't?
Findout the percentage of trainees earns less than $900 a month utilizing normal distribution.What percentage of trainees earns less than $900 a month?
In a bumper test, three types of autos were deliberately crashed into a barrier at 5mph, and the resulting damage (in dollars) was estimated. Five test vehicles of each type were crashed, with the results shown below. Are mean crash damages the sa..
State the correct decision and give justification for your decision.
Pretest-posttest design and internal validity threats - please discuss all threats to internal validity.
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