If n=23, ¯x(x-bar)=34, and s=8, find the margin of error at a 99% confidence level Give your answer to two decimal places.

A population of N = 20 scores has a mean of = 10. One score in the population is changed from X = 25 to X = 5.  What is the value of the new population mean?

In a population of scores, x=45 corresponds to z=+2.00 and x=30 corresponds to z=-1.00 what is the population mean

After three exams Denny has a mean score of 74 with only one exam remaining in the class what is the minimum score she will need on that exam to have an overall of an 80

. Students may be classified as having a math dysfunction—and not have to take statistics—if they score below the 25th percentile on a diagnostic test. The m of the test is 75 and sX  10. Approximately what raw score is the cutoff score needed to avoid taking statistics?

ABC company has recently experienced a sharp decline in its stock price. Its current (time 0) stock price is $42.65, and this morning, it paid $5.00 per share. Given that the stock price four years ago was $82.88, complete the following time series of data by determining the missing values. t= -3, Pt =$83.43, Divt = $16.03, Rt = (1)t= -2, Pt =$85.20, Divt =(2),           Rt = 22.8482%t= -1, Pt =(3),          Divt =$17.50, Rt = 20.6572%t= 0, Pt =$42.65, Divt =$5.00,     Rt =(4)

A large automobile insurance company selected samples of single and married male policyholders and recorded the number who made an insurance claim over the preceding three-year period. Z-value p-value Single Policyholders n₁ = 440 Number making claims = 88 a. Use a = 0.05. Test to determine whether the claim rates differ between single and married male policyholders. (to 2 decimals) (to 4 decimals) X Married Policyholders n2 = 840 Number making claims 126 We can conclude ✔ that there is the difference between claim rates. b. Provide a 95% confidence interval (to 4 decimals) for the difference between the proportions for the two populations. Enter negative answer as negative number. X * )

It is bleieved that the percent of convicted felons who have a history of juvenile deliquency is 70%.  Is there evidence to support the claim that the actual percentage is more than 70% if out of 200 convicted felons, we find that 154 have a history of juvenile deliquency?  Set the level of significance at a = 0.05

A study done in 1997 showed that 4.2% of mothers smoked cigarettes during their pregnancy. An obstetrician feels that this percentage is higher now. To test this, the obstetrician takes a sample of 200 mothers and finds that 10 of them smoked during their pregnancy. Test the obstetrician's claim at the a=0.05 level of significance. Write your answer in the following form P-Value, Conclusion Example: 0.15, There is not sufficient evidence that the mean weight of pandas is less than 200 pounds. Edit View Insert Format Tools Table 12pt v Paragraph v BIUA e T?u 画① O words ņ V12 96 5n SO F H. B N2

You want to conduct a study on the proportion of Penn State students who miss class when it is raining. Suppose here is the data you collect for students who live on-campus versus students who live off-campus: Never Miss Sometimes Miss Always Miss On-Campus 20 12 13 Off-Campus 45 14 22 a. For on-campus students (only), estimate the true difference in proportions for those who never miss class versus those who always miss class, when it is raining. Place a bound on the error of estimation. b. Estimate the true difference between the proportions of on-campus students who always miss class versus the proportion of off-campus students who always miss class, when it is raining. Place a bound on the error of estimation.