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A student believes that no more than 25% (i.e., 25%) of the students who finish a statistics course get an A. A random sample of 100 students was taken. Twenty-six percent of the students in the sample received A's. Test the hypotheses at the 5% level of significance. What is the critical value? What is the calculated Z-test statistic? What are your conclusions regarding the assumption of the proportion of students that make an A in statistics?
a sample of 3 items is selected at random from a box containing twenty items of which 4 are defective. the expected
The random sample population is 500 people who shop for workout programs and equipment. The sample mean of those shopping is that they spend an average of $250.00 per purchase and perchance at least 2 to 3 items for working out and weight lost
an independent-measures research study uses two samples each with n 12 participants. if the data produce a t statistic
Your office has just received 128 insurance claims to be processed in the next few days. What is the probability that half or more of the claims have been padded?
as a sample size approaches infinity how does the students t distribution compare to the normal z distribution? when a
marty rowatti recently assumed the position of director of the ymca of south jersey. he would like some current data on
At.01 significance level, is there difference in mean number of times men and women order take-out dinners in month? Determine the p -value?
Find a 99%. confidence interval for the difference between the average grades for the two courses. Assume the populations to be approximately normally distributed with equal variances.
A random sample of 8 recent batches produced the following yields. Conduct a hypothesis test to determine whether the true mean yield has decreased.
The number of shark attacks per year in the US is distributed approximately normal, with a Variance of 31.8 and a standard deviation of 10.
Calculate appropriate summary statistics. Incorporate these graphs and statistics into a well written summary. How could you apply statistical critical thinking in this situation?
Assuming that numbers of crimes in 4-weekly periods are independent, what is the probability that there will be at least 17 in the last three of the next six 4-week periods? explain your answer
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