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Using normal distribution, you take a random sample of 25 employees and find that the sample mean annual contribution per employee is $501 with a standard deviation of $17. What are the boundaries for a 99% confidence interval for the population mean?
An advisor to the mayor of a large city wants to estimate within 2450 minutes the mean travel time to work for all employees who work within the limits of the city. He knows that the standard deviation of all travel times is 11.35 minutes, he also wants to achieve a 95% confidence interval. He will poll a random sample of employees, how many should he poll?
You ask 2500 actors if they have appeared in a production and 1225 say yes while the rest say no. The value p is the proportion of actors who have appeared in one. You next draw a random sample of 11 actors. What are the mean and standard deviation of the sample proportion?
a consumer group is interested in estimating the proportion of packages of ground beef sold at a particular store that
(c) Sketch the graph of f ( y) and show the area representing the desired probability.
State the direction of the alternative hypothesis used to test that the demand function is downward sloping. Type gt (greater than), ge (greater than or equal to), lt (less than), le (less than or equal to) or ne (not equal to) as appropriate in the ..
Should the criminal justice system be allowed to use the "collateral consequences" rule to mitigate penalties or reduce punishment for large corporations
a survey of an urban university population of 25450 showed that 870 of 1100 students sampled supported a fee increase
If public education fails to improve the quality of instruction in both primary and secondary schools, then it is likely that it will lose additional students.
A California study concluded that following 7 simple health rules can extend a man's life by 11 years on the average and a woman's life by 7 years.
if the computed value of a chi-square statistic is less than the critical chi-square value reject the null hypothesis
This exercise is a "what if analysis" designed to determine what happens to the test statistics and interval estimates when elements of the statistical inference change.
Two servers with lambda 1 & lambda 2 service times exponentially distributed. Pat waits in a line to get served by any of the two servers. What is the waiting time of pat if no one is on the line?
Explain the use of and and or in probabilities. How would you change your calculation based on the language of the problem?
he chi-square test ignores the ordering of the responses. Use the Kruskal-Wallis test (with many ties) to test the hypothesis that some SES classes smoke systematically more than others.
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