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Illustrate the decision rule graphically An insurance industry report indicated that 40 percent of those persons involved in minor traffic accidents this year have been involved in as a minimum one other traffic accident in the last five years. An advisory group decided to investigate this claim, believing it was too large. A sample of 200 traffic accidents this year showed 74 persons were also involved in another accident within the last five years. Use the 0.01 significance level. Show the decision rule graphically.
The mean return for the random sample of 33 mutual funds is 14.93 percent with a standard deviation of 9.57. Test the null hypothesis: H0: mu = 15% at α = 0.05.
Describe the factors that might cause variation in weight of Tootsie Rolls during manufacture.
What is the possibility that for a arbitrarily selected customer the service time could exceed 3 minutes?
State the null and the alternative hypotheses. Using the p-value approach, test to determine whether or not the mean age of all employees is significantly more than 40 years.
Formulate the hypotheses that can be used to test the validity of the brokerage firm executive's claim.
Suppose Abraham Lincoln had answered a survey questionnaire in which he indicated that he had not received a grade school diploma. The researcher found that Lincoln's educational score did not correlate with the expected variables. What was wrong?
At 0.05 level of significance, is there evidence of significant relationship between age group and where people mainly get their news? If so, describe the relationship.
For which of given variables must a "two tail" t-test be applied?
A researcher measures a response variable Y and explanatory variable X on each of several objects. A scatterplot of the measurements is as follows.
The means appear to be very close, but not the variances. At α = .05, is there a difference in variances? Show all steps clearly, including an illustration of the decision rule.
At.01 significance level, is there difference in mean number of times men and women order take-out dinners in month? Determine the p -value?
Calculate the population mean and population standard deviation.
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