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A random sample of 12 second-year university students enrolled in a business statistics course wasdrawn. At the course's completion, each student was asked how many hours he or she spent doinghomework in statistics. The data are listed here. It is known that the population standard deviation is ? = 8.0. The instructor has recommended that students devote 3 hours per week for the duration ofthe 12-week semester, for a total of 36 hours. Test to determine whether there is evidence that the average student spent less than the recommended amount of time. Use a 5% significance level.
31 40 26 30 36 38 29 40 38 30 35 38
1. what are the hypotheses?
2. what is the rejection region?
3. what is the test statistic?
4. what is the p-value?
5. The conclusion of the hypothesis testing is:
Analysis of variance (ANOVA) is used to determine if there is a difference between the means of different populations. This is an example from a student in Prescott Arizona.
chi-square test for independence of attributes.an investment portfolio manager categorized her investors as having
Suppose that a guest claims that she played the slot machine 5 times and hit the jackpot twice. Find the probability of exactly 2 jackpots in 5 trials.
Research by the Illinois Banking Company revealed that only 10 percent of their customers wait more than five minutes to do their banking. Management considers this reasonable and will not add more tellers unless the proportion becomes larger than..
the time it takes a ski patroller to respond to an accident call has an exponential distribution with an average
1. the correlation between two variables is 0.8 for a sample of 10 observations. we wish to show there is a positive
Let x denote the total number of steps required to do the analysis (both procedures). Show the value of the random variable for each of the experimental outcomes.
Determine the probability of randomly selecting 10 production employees on hot summer day and determining that none of them are absent?
The true proportion of tall peas (based on a 3:1 phenotypic ratio) is 3/4 or p = 0.75. What is the probability that 5 are tall and 5 are dwarf.
a manuscript is sent to a typing firm consisting of typists a b and c. if it is typed by a then the number of errors
How much does a typical employee and his or her family spend per year on dental expenses? Construct a 95 percent confidence interval for the population mean. Interpret the interval.
Let X 1 , X 2 , X 3 , X 4 be a random sample from a Poisson distribution with parameter λ and let Y = X 1 + X 2 + X 3 + X 4 . You decide to test λ = 1.60 versus λ
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