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Is there a difference in the number of points students earned on their educational statistics pretests and posttests?
what is the probability that a randomly selected value from the distribution will be greater than 2.1 standard deviations avoe the mean?
A random sample of 12 paired observations indicated a correlation of .32. State the decision rule for .05 significance level. Compute the value of the test statistic.
Consider the following results for two samples randomly taken from two populations. Construct a 98 percent confidence interval estimate of the difference between the two sample means.
A raondom variable is normally distributed with a mean of 25 and a standard deviation of 5. What value is exceeded 10% of the time?
Determine the probability that a randomly chosen person has at least some confidence in small businesses. Again based on part (a), find the similar probability for big businesses.
What is the probability that a randomly selected monthly cell phone bill is more than $100? What is the probability that a randomly selected monthly cell phone bill is between $60 and $83?
A bag contains 12 colored balls, each ball being either black or white. The probability of drawing a white ball twice with replacement is 1/16. How many white balls are in the bag?
Assuming that the systolic blood pressures of deep sea divers are normally distributed, if the doctor wanted to test her research hypothesis at the .01 level of significance, what is the critical va
Compute the p-value associated with this test. Place your answer, rounded to 4 decimal places, in the blank. For example, 0.3456 would be a legitimate entry.
The first set of tosses yielded HTHTTH and the second set of tosses yielded TTTHHH. Which set of tosses is more probable to happen? And why?
5 computer scientists and 6 systems engineers? Think carefully about the counting rules involved before attempting to do any calculations.
An electronics company is about to launch a new product. If the serial number for each piece produced has the following format. What is the name of the counting rule used to find all the possible outc
172 of 211 babies born to parents using the YSORT method were boys. If the sign test used, why is it considered to be a "nonparametric" test of a "distribution-free" test?
According to the Federal Reserve Board, the average credit card debt per U.S. Determine the percentage of households that have a credit card debt of more than $13,000.
What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and the girls?
What is wrong with gauging stockholder views about employee benefits by mailing a questionnaire that IBM stockholders could complete and mail back?
The useful life of an electrical component is exponentially distributed with a mean of 2500 hours. What is the probability the circuit will last more than 3,000 hours.
Heights, would you say that trimming the mean is a good idea? What are the advantages of trimming the mean in this situation? What are the disadvantages?
Are the poll results likely to be valid if they are based on only those subjects who agree to respond? what should polling organizations do when they encounter a subject who refuses to respond?
Construct three scatter plots for: (1) percentage alcohol versus calories, (2) percentage alcohol verses carbobydrates, and (3) calories versus carbohydrates.
What is the probability that the offspring will not have the disease. In other words what is the probability that offspeing will have genotype ss interpret this probability
Does there seem to be any difference in the effect of the antibiotics on clearance of otitis media? Express your results in terms of relative risk (RR).
Assume gasoline prices for a region are normally distributed. Do the data you obtained provide enough evidence to reject the claim? Use a 1% level of significance.
Sea Fair Fashions relies on its sales force of 220 to do an initial screening of all new fashions. Determine the probability the sample of 40 will have a sales average less than $400,000.