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Question: A consumer agency wanted to find out if the mean time taken by each of three brands of medicines to provide relief from a headache is the same. The first drug was administered to six randomly selected patients, the second to four randomly selected patients, and the third to five randomly selected patients. The following table gives the time (in minutes) taken by each patient to get relief from a headache after taking the medicine.
At the 2.5% significance level, will you conclude that the mean time taken to provide relief from a headache is the same for each of the three drugs?
Assuming that the "acting time" measurements are normally distributed, carry out an appropriate hypothesis test and, at the signif- icance level of α = 0.05, make an informed recommendation regarding the tested rat poison's "acting time."
hurricane katrina forced insurance companies to examine policy rates which previously determined that an average claim
a selection of cereals was sampled and the number of calories was plotted against the number of grams of protein with
In a large section of statistics class, the points for the final exams are normally distributed with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule.
A Correlation matrix (correlation, coefficients and probability level under the hypothesis rho = 0) for a company's sales force (age, years of service, and current sales) is given below. Comment.
what is the value for x2left for a 95 confidence interval when n 18?a. 7.564b. 8.672c. 9.390d.
Mauricio Cruz, a wine merchant for Cruz's Spirits Emporium, wants to determine if the average price of imported wine is less than the average price of domestic wine. The data obtained is shown in the table below.
1 an 8-card hand is dealt from a standard deck of 52 playing cards. what is the probability thata you are dealt at most
An oil co. is drilling some wells. the results are described as either a dry well or a producer well. Past experience suggests that 10% of exploratory wells are producer wells.
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.
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the mean number of errors per page made by a member of the word processing pool for a large company is thought to be
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