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The Federal Trade Commission provided measured tar contents (in mg) of randomly selected filtered and nonfiltered king-size cigarettes. A random sample of 21 filtered king-size cigarettes has a mean tar content of 13.3 mg with standard deviation 3.7 mg. A random sample of 8 nonfiltered king-size cigarettes has a mean tar content of 24.0 mg with standard deviation 1.7 mg. Assuming unequal variances between the two populations of cigarettes, you need to test the claim that the mean amount of tar in filtered king-size cigarettes is less than the mean amount of tar in nonfiltered king-size cigarettes at a 0.05 significance level. What type of statistical test should I use and what should I use for the value of the test statistic?
The claim is that for measurements of standard head injury criteria in car crashes, u = 475 HIC. The sample size is n = 21 and the test statistic is t = -2.242
(a) State the appropriate hypotheses in this case, defining any parameters you use. (b) Somehow the p-value did not get printed. Use the Vassar applet to compute the p-value. (c) Carefully state your conclusions based on these data. Use a level of si..
Use a statistical software package to construct a normal probability plot of the tensile ultimate-strength data given in Exercise 13 of Chapter 1, and comment
a friend of mine is giving a dinner party. his current wine supply includes 8 bottles of zinfandel 12 of merlot and 11
The numbers of units purchased as a result of each sales call are shown here. Use the 0.05 level in determining whether the three sales presentations could be equally effective.
1. An investment account is advertised as offering an interest rate of 15% p.a. compounded monthly. (a) Find the effective interest rate per annum. (b) Use the Excel function EFFECT to find the effective rate.
the scores on a standardized test had mean of 2.711 and a standard deviation of 1.335. a teacher had 61 students take
Decide if the events are mutually exclusive. Explain your reasoning. 1. Event A: Roll a 2 on a die. Event B: Roll a 5 on a die. 2.
The first week he called 200 people, but only made 10 sales. Should he suspect he was misled about the true success rate? Explain.
a diagnostic test for a certain disease is applied to n individuals known to not have the disease. let x the number
The standard error of the difference was 1.20. Establish a 99 percent confidence interval about the mean difference and write an interpretation.
The following is based on the normal distribution of scores with mean equal to 90 and standard deviation equal to 3.5. Determine the probability of a score falling between a raw score of 84 and 96?
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