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1) Computer manufacturer offers help line that purchasers can call for help 24 hours a day 7 days a week. Clearing these calls for help in timely fashion is significant to company's image. After telling caller that resolution of problem is significant the caller is asked whether issue is "software" or "hardware" related. Mean time it takes technician to resolve software issue is 18 minutes with standard deviation of 4.2 minutes. This information was attained from sample of 35 monitored calls. For study of 45 hardware issues, mean time for technician to resolve the problem was 15.5 minutes with standard deviation of 3.9 minutes. This information was also attained from monitored calls. At.05 significance level is it reasonable to conclude that it takes longer to determination software issues? Determine the p-value?
Q2) Liquid chlorine added to swimming pools to combat algae has relatively short shelf life before it loses its effectiveness. Records point out that mean shelf life of 5-gallon jug of chlorine is 2,160 hours (90 days). As the experiment, Holdlonger was added to chlorine to determine whether it would rise the shelf life. A sample of nine jugs of chlorine had these shelf lives (in hours):
2,159
2,170
2,180
2,179
2,160
2,167
2,171
2,181
2,185
At.025 level, has Holdlonger increased shelf life of chlorine? Evaluate the p-value.
Ninety of the sample students are in the Business College, 120 are in the Liberal Arts College, and 90 are in the Education College.
Develop a linear regression equation for the given data and forecast how much money Robert will win if he spends $30.
Why is it misleading to draw the conclusion from the test above that long-time exposure to cadmium reduces the vital capacity?
An advantage of the permutation test over the t test for a difference in means, can Permutation tests be used for tests when we believe the two populations differ under the null hypothesis.
A major benefit of two-way ANOVA over several one-way ANOVAs, If an F test for interaction is significant.
A busy landscaping supplies company sells wood chips for garden mulch. The mulch is sold by the cubic metre and delivered to households in a small truck.
Using the probabilities above what is the expected size of family you draw?
What is the probability of this actually happening?
Write the null and alternative hypotheses you would use to test the following situation.
Suppose the population standard deviations are not the same. At.05 significance level, is there a difference in mean waiting time?
he population consists of all 15 year olds living in the attendance district of a local high school. You plan to obtain a simple random sample of 200 such residents by using the roster of the high school as the sampling frame.
Support colour-coding on packaged food to indicate healthier options
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