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- chwelveShow complete solutionA worldwide organization of academics claims that the mean IQ score of its members is 112, with a standard deviation of 17 . A randomly selected group of 35 members of this organization is tested, and the results reveal that the mean IQ score in this sample is 116.4. If the organization's claim is correct, what is the probability of having a sample mean of 116.4 or less for a random sample of this size? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places. 0 X Español ? Aa
- Standard Normal Distribution Man00 Standare Deviaton10 The probability of obtaining a sample mean greater than the mean of Sample 103 is If the sample you select for your statistical study is 1 of the 200 samples you drew in your repeated sampling, the worst-luck sample you could draw is (Hint: The worst-luck sample is the sample whose mean is farthest from the true mean. You may find it helpful to sort the sample means: In Observations view click the arrow below the column heading Sample Means.)Carect answers please fastParts a-c
- A sports reporter conducts a study of the fans' overall satisfaction with the sporting event after the event is completed. He surveys 165 randomly selected fans on their way out of the event and asks them to rate their satisfaction with the event on a scale from 0 to 10. The average satisfaction rating is 6.9. It is known from previous studies of this type that the standard deviation in satisfaction level is 2.5. Calculate the margin of error and construct the 95% confidence interval for the true mean satisfaction level for the sporting event. Standard Normal Distribution Table ΕΞ Dound in th SAMSUNG SUBMIT QUESTION THES SAVE PROGRESS SUBMITFor the Normal Distribution curve below, what percentage of the values lie between 2 standard deviations of the mean? *When does the chi-square distribution approximate the normal distribution? df > 30 df > 90 df > 1000 It never approximates the normal distribution.
- Standard Normal Distribution Identify the requirements necessary for a normal distribution to be a standard normal distribution.Over the years, the mean customer satisfaction rating at a local restaurant has been 85. The restaurant was recently remodeled, and now the management claims the mean customer rating, u, is not equal to 85. In a sample of 42 customers chosen at random, the mean customer rating is 83.1. Assume that the population standard deviation of customer ratings is 5.3. Is there enough evidence to support the claim that the mean customer rating is different from 85? Perform a hypothesis test, using the 0.05 level of significance. (a) State the null hypothesis H, and the alternative hypothesis H,. H,: I OO H: 0 D=D0 (b) Perform a Z-test and find the p-value. Here is somne information to help you with your Z-test. • The value of the test statistic is given by