1-20chapter stats

Calculate the expected number of conforming units

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Unformatted text preview: ted that in order to perform various statistical tests, the data must be distributed according to normal distribution. In order to determine whether the selling prices of homes included in the random sample are normally distributed, the data is divided into 6 classes of equal size and the number of observations in each class is recorded. The chi-square goodness of fit test for normal distribution is performed and the results are summarized in the following table: What is the appropriate null hypothesis? A. H0: The residential home selling prices are distributed according to normal distribution. B. H0: The residential home selling prices are not distributed according to normal distribution. C. H0: The distribution of residential home selling prices is either right or left skewed. D. H0: The distribution of the residential home selling prices is symmetric. E. None of the above is correct. 1-1046 Chapter 01 - An Introduction to Business Statistics 39. A real estate company is analyzing the selling prices of residential homes in a given community. 140 homes that have been solved in the past month are randomly selected and their selling prices are recorded. The statistician working on the project has stated that in order to perform various statistical tests, the data must be distributed according to normal distribution. In order to determine whether the selling prices of homes included in the random sample are normally distributed, the data is divided into 6 classes of equal size and the number of observations in each class is recorded. The chi-square goodness of fit test for normal distribution is performed and the results are summarized in the following table: What are the degrees of freedom for the chi-square test? A. 2 B. 3 C. 4 D. 5 E. 6 1-1047 Chapter 01 - An Introduction to Business Statistics 40. A real estate company is analyzing the selling prices of residential homes in a given community. 140 homes that have been solved in the past month are randomly selected and their selling prices are recorded. The statistician working on the project has stated that in order to perform various statistical tests, the data must be distributed according to normal distribution. In order to determine whether the selling prices of homes included in the random sample are normally distributed, the data is divided into 6 classes of equal size and the number of observations in each class is recorded. The chi-square goodness of fit test for normal distribution is performed and the results are summarized in the following table: At a significance level of .05, what is the appropriate rejection point condition? A. Reject H0 if χ2 > 12.5916 B. Reject H0 if χ2 > 11.0705 C. Reject H0 if χ2 > 9.3484 D. Reject H0 if χ2 > 7.81473 E. Reject H0 if χ2 > 9.48773 1-1048 Chapter 01 - An Introduction to Business Statistics 41. A real estate company is analyzing the selling prices of residential homes in a given community. 140 homes that have been solved in the past month are randomly selected and their selling prices are recorded. The statistician working on the project has stated that in order to perform various statistical tests, the data must be distributed according to normal distribution. In order to determine whether the selling prices of homes included in the random sample are normally distributed, the data is divided into 6 classes of equal size and the number of observations in each class is recorded. The chi-square goodness of fit test for normal distribution is performed and the results are summarized in the following table: At a significance level of .05, we: A. Reject H0 and conclude the residential home selling prices are not distributed according to normal distribution. B. Failed to reject H0 and conclude the residential home selling prices are not distributed according to normal distribution. C. Reject H0 and conclude the residential home selling prices are distributed according to normal distribution. D. Failed to reject H0 and conclude the residential home selling prices are distributed according to normal distribution. 42. In performing a chi-square goodness of fit test for a normal distribution, if there are 7 intervals, then the degrees of freedom for the chi-square statistic is ______________. A. 7 B. 3 C. 4 D. 6 1-1049 Chapter 01 - An Introduction to Business Statistics 43. The number of degrees of freedom associated with a chi-square test for independence based upon a contingency table with 4 rows and 3 columns is _____. A. 7 B. 12 C. 5 D. 6 44. An experiment consists of 400 observations, and four mutually exclusive groups. If the probability of a randomly selected item being classified into any of the four groups is equal, then the expected number of items that will be classified into group 1 is _____. A. 25 B. 100 C. 125 D. 150 45. The chi-square goodness of fit test for multinomial probabilities with 5 categories has _____ degrees of freedom. A. 5 B. 4 C. 3 D. 6 46. While a binomial distribution describes a cou...
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This document was uploaded on 01/20/2014.

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