NORMAL AND SAMPLING DISTRIBUTION 1. You were told that the mean score on a statistic exam is 75 with the scores normallydistributed. In addition, you know the probability of a score between 55 and 60 is 4.41%and that the probability of a score greater than 90 is 6.68%.athe probet95?c) What is the probability of a score lower than 55?d) The middle 86.64% of the students will score between which two scores?e) The middle 95.46% of the students will score between which two scores?

Let X denote the score on a statistic exam. X follows a normal distribution with mean μ and standard…

Answered: 1. You were told that the mean score on…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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.)
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The following data represent a portion of quarterly net sales (in $ millions) of Lowe's Companies, Inc., over five years. Net Sales 8861 10169 1 9984 Source: All data retrieved from Annual Reports for Lowe's Companies, Inc. Click here for the Excel Data File a-1. Estimate an exponential trend model with seasonal dummy variables. (Round your answers to 4 decimal places.) Year 2004 2004 2008 Intercept d1 d2 d3 t Variable Quarter 1 2 1 1 Se Exponential Trend A 1 Year 2 2004 3 2004 4 2004 5 2004 6 2005 7 2005 8 2005 9 2005 10 2006 11 2006 12 2006 13 2006 14 2007 15 2007 16 17 2007 2007 2008 18 19 2008 2008 20 21 2008 B Quarter 123-AWNA W NAWN-AW23 4 4 3 4 4 4 C Net Sales 8861 10169 9064 8550 9913 11929 10592 10808 11921 13389 11211 10406 12172 14167 11565 10379 12009 14509 11728 9984
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Probability for No. 4 showing in 8 rolls of dice of a standard die. Find the mean and standard deviation of the distribution.
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 SUBMIT
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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

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