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How many cars must be randomly selected and tested in order to estimate the mean braking distance of registered cars in the US to give a 99% confidence that the sample mean is within 2 ft of the population means. The population standard deviation is known to be 7 ft. Among 724 patients treated with a new medication for ADHD, 72 experienced nausea as an adverse reaction. Use a 0.05 significance level to test the claim that the rate of nausea is greater than the 6% rate experienced by patients treated with a placebo. Does nausea appear to be a concern for those given the new medication? Be sure to include hypotheses, test statistic z, and decision. The population has a mean of 678 and the population standard deviation is known to be 58.3. Use a 0.05 level of significance to test the claim that the sample scores listed below came from the population. Identify hypotheses, test statistic, P-value or critical value, conclusion about the null, and final conclusion that addresses the original claim. 714 751 664 789 818 779 698 836 753 834 693 802 Consider the hypothesis test given by H_0: µ = 530 H_1: µ ≠ 530 In a random sample of 81 participants, the sample mean is found to be x ¯ = 524 and the population standard deviation is σ = 27. Determine the P-value for this test. Is there sufficient evidence to justify the rejection of the null hypothesis at α = 0.01 level?
Find the mean, median, mode, and midrange for these data.
Assume that a decision maker wants to estimate a population proportion with 90% confidence and a margin of error of ±0.03. The decision maker has obtained a pilot sample of 10.
What is the probability that he or she is a Coalition voter (rounded to 3 decimal places)?
Each organization gets a 90% confidence interval. About how many of these intervals should cover the population average?
The following data lists the number of hours spent working during the previous week. From these data round the relative frequencies to three decimal places.
The sample size n , the sample means, and the sample standard deviations for the two groups are given below.
illustrate briefly how an experimental study is conducted. What is the difference between the two types of variables used.
What descriptive summary measures would you use to present the data. which measure is the best to use and which is the worse and why?
Which of the following models satisfies the rules of probability and The event corresponding to the above system functioning properly during one period of operation is
Toledo, OH has been experiencing improved economic growth following huge capital investments from companies like Chrysler. You have just been hired by RGP, an agency for facilitating business expansion and location in the Toledo metropolitan area.
Speed of cars travelling on I-85 in Gaston County is normally distributed with average speed (µ) of 66 MPH and standard deviation (σ) of 8 MPH.
The diameters of oranges in a certain orchard are normally distributed with a mean of 5.26 inches and a standard deviation of 0.500 inches.
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