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An important feature of tales is vattery life, the number of hours before the battery needs to be recharged. The file Tablets contains the battery life of 12 WiFi-only and 7 3G/4G/WiFi 9 through 12-inch tablets.
a. Assuming that the population variances from both types of tablets are equal, is there evidence of a difference in the mean battery life between the two types of tables? (Use a=0.05)
b. Determine the p-value in (a) and interpret its meaning.
c. Assuming that the population variances from both types of tablets are equal, construct and interpret a 95% confidence interval estimate of the difference between the population mean battery life of the two types of tablets.
A certain firm specializing in the manufacture and sale of free time clothing has 80 retail stores in Florida and 140 in California. With each state as a stratum, the firm wishes to estimate average sick-leave time per employee for the past year
He is quoted by the Associated Press (January 30, 2000) as saying, "Field's sample in that poll equates to one out of 17,505 voters," and he added that this was so dishonest that Field should get out of the polling business! If you worked on the ..
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find the standard normal area for each of the following round your answers to 4 decimal places.standardnormal areaa
An efficiency study was done on the delivery of first-class mail originating from the four cities listed in the following table. Recorded for each city was the average length of time (in days) that it took a letter to reach a destination in t..
In a code division multiple access (CDMA) communications system, k users share a radio channel using a set of n-dimensional code vectors {S1,..., Sk} to distinguish their signals.
A side effect of a certain anesthetic used in surgery is the hiccups, which occurs in about 10 percent of the cases. If three patients are scheduled for surgery today and are to be administered this anesthetic, compute the probability that
suppose sample size n100 sample proportion .25 the null hypothesis is that the true proportion 0.20 and the
a new integrated computer system is to be installed worldwide for a major corporation. bids on this project are being
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In the past an autoobile repair shop owner has noticed that sales increased ats certain economic indicators decreased. Calculate the expected sales increase and the standard deviation.
Assuming the requirements of ANOVA are satisfied, at the .05 level of significance, is there evidence of a significant difference among the mean wait times at the five checkpoints?
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