F1 data:w* females 1278w males1215w females108w* males 100Use a chi-squared test to test for a deviationfrom an expected 10% error rate (108+100errors compared to 10% of the total and1278+1215 non-errors compared to 90% ofthe total).Is there a significant deviation fromexpected?a) Expected number of females ?b) Expected number of males ?c) Degrees of freedom ?d) chi-square sum ?e) P-value ?

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Answered: F1 data: w+ females 1278 1215 108 w…

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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Consider the data set. 2, 4, 5, 6,9 c) Use the defining formula to compute the population standard deviation o. (Round your answer to two decimal places.)
ESP People who claim to “have ESP” participate in a screening test in which they have to guess which of sev-eral images someone is thinking of. You and a friend both took the test. You scored 2 standard deviations above themean, and your friend scored 1 standard deviation belowthe mean. The researchers offer everyone the opportunityto take a retest.a) Should you choose to take this retest? Explain.b) Now explain to your friend what his decision shouldbe and why.
Meals A college student on a seven-day meal plan reportsthat the amount of money he spends daily on food varieswith a mean of $13.50 and a standard deviation of $7.a) What are the mean and standard deviation of theamount he might spend in two consecutive days?b) What assumption did you make in order to find thatstandard deviation? Are there any reasons you mightquestion that assumption?c) Estimate his average weekly food costs, and thestandard deviation.d) Do you think it likely he might spend less than $50in a week? Explain, including any assumptions youmake in your analysis.
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Maxwell’s hot chocolate is concerned about the effect of the year-long coffee advertising campaign on the chocolate sales. The weekly hot chocolate sales from 15 locations (in this year) is collected and summarized in the following table. Descriptive Statistics N Sum Range Minimum Maximum Mean Std. Deviation Variance Sales 15 --- --- 20 197 24.80 3.53 12.46a) Calculate the missing values in the table (Sum and Range)b) The average sales was $26.6 last year and the manager of the firm claim that there is a decrease in the sales this year. Does the data provide sufficient evidence to support the claim of the manager at 1% significance level? Show your calculations in detail and interpret the result.
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a) State the mean and standard deviation of the standard normal curve. b) Find the z-score for which 95% of the distribution’s area lies between –z and z. c) Extending the meaning in part b, only 2.5% of z-scores would lie above ________.
rary > MAT 240: Applied Statistics home > pothesis tests for the difference between two population means A company that develops an automated customer service model is interested in knowing whether two versions, Version A and Version B, will get different ratings from customers. Participants in a focus group are taken through samples from both versions, then take a survey to rate each version. A summary of the data obtained from the study is given below. Assume ratings from the different surveys generally have the same standard deviation. Version A Version B Mean 39.333 34.4 Observations Pearson Correlation -0.011 0 Hypothesized Mean Difference -2.086 P(T H
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In a scholastic aptitude test, mean score for the three parts are:Critical reading 410Mathematics 425Writing 480Assume that the population variance on each part of the test is 6400. What is the probability a sample of 100 test takers will provide a sample mean test score within 10 points of the population mean of Critical Reading part of the test?

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