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A Rollercoaster's auditors estimate that the average daily loss from those illegally riding without tickets is never more than $200, but wants to determine the accuracy of this statistic. The company researcher takes a random sample of losses over 49 days and finds that = $187 and s = $30.
a) Test at α = 0.05.
b) Construct a 95% confidence interval of losses.
The average salary of a group of sales people is $32,500 with a standard deviation of $2,500. Answer the following: How much would a salesperson make if he/she is 2 standard deviations above the mean?
question the president of a company that manufactures drywall wants to analyze the variables that affect demand for his
Test the hypothesis that whether it rains tomorrow is independent of the color of today's sunset.
When a certain type of thumbtack is flipped, the probability of its landing tip up (U) is 0.60 and the probability of its landing tip down (D) is 0.40.
Calculate the proportion of scores between 20 and 30. Be careful with this one; drawing a picture is especially advised.
Random sample with a normal distribution with a mean of 60,000 and standard deviation of 2300. What warranty should the company us if they want 96% of the tires to outlast the warranty?
assume that the number of sick kids in a family is a discrete random variable x with probability function px
What is the probability that the product of the two rolls is at most 5 given that the first one is an even number?
timber yield is approximately equal to the volume of a tree however this value is difficult to measure without first
If µ = µ1 = µ2 = µ3 = 60 and σ21 = σ22 = σ23 = 15, calculate the probability that the total time to finish the three repair tasks is at most 200 minutes.
Describe the population and the sample in this problem.- Is this a random sample? If so, justify your answer. If not, describe a technique for obtaining a random sample.
A sample of 10 persons is used to measure the effectiveness of two massage techniques. The effectiveness of the techniques is measured by the number of days that pass by before the subjects feel the need for another massage session.
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