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Twenty students agreed to participate in a new type of learning program to increase their typing efficiency. It was accepted that prior to beginning the new learning process their mean was 60 words per minute. Upon completing the new program, the students' mean was 65 words per minute with a sample standard deviation of 10. Did the learning process help the students increase their typing efficiancy significantly? Assume alpha=0.05
A survey of 600 non-fatal accidents showed 259 involved the use of a cell phone. Construct a 99% confidence interval for the proportion of fatal accidents that involved the use of a cell phone?
What are the appropriate H0 and Ha for each of the following research studies? In addition, note whether the hypothesis test is one- or two-tailed.
Three consecutive even integers are such that the square of the third is 76 more than the square of the second. Find the three integers.
If the average importance were computed for each group, would you expect the sample means to be similar or different? What was the total sample size in this study?
At the 0.05 level of significance can it be concluded that the population mean height of treated plants is difference from 38 centimeters?
consider a sequence of independent bernoulli trials with p0.28.a what is the expected number of trials to obtain the
the correlation between incidence of pancreatic cancer and alcohol consumption is 0.78 while the correlation between
the average of chemical engineers is 39yrs with a standard deviation of 4rs. if an engineer firm employs 24 chemical
4 clothing manufacturer tests SRS of 5 specimens of each fabric. Determine the probability that mean breaking strength of 5 untreated specimens exceeds 50 pounds?
A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights. The Traffic Department claims that a modification in the type of light will reduce these accidents.
Draw a histogram showing the 20 sample means. (Use classes -0.5 to 0.5, 0.5 to 1.5, 1.5 to 2.5 and so on). Describe the distribution of the x-bars that you see in part b (shape of distribution, center, and the amount of dispersion).
art students are registered for the same class and attend independently of each other.student a 80 of the timestudent b
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