A wine producer believes that a new advertisement will increase product sales inLCBO by an average of 50 cases in a week. For a random sample of 20 LCBO stores, itwas found that the average sales increase was 41.3 cases, and the sample standarddeviation was 12.2 cases.Test the null hypothesis that the population mean sales increase is at least 50 cases,stating any assumptions you can make. Use 5% as a significant level.(You NEED to use BOTH the Critical-value approach and p-value approach to get afull mark).a) None of the answers are correctOb) Do not reject the null hypothesisO) Reject the null hypothesis.

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Answered: A wine producer believes that a new…

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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Many psychologists are concerned that the average level of anxiety in children has increased over the past 40 years. In the 1980s, the population average score on the Child Manifest Anxiety Scale (CMAS) was 15.1. In 2021, a random sample of 101 children was tested with CMAS. The mean for the sample was 16.1 with the standard deviation of 4. Is there enough evidence to claim that there has been a significant change in the average level of anxiety since the 1980s? Conduct the appropriate statistical test (two- tailed) with a = .05. Based on the information provided above, which statistical test seems most appropriate? independent samples t test z test dependent samples t test one sample t test
Many psychologists are concerned that the average level of anxiety in children has increased over the past 40 years. In the 1980s, the population average score on the Child Manifest Anxiety Scale (CMAS) was 15.1. In 2021, a random sample of 101 children was tested with CMAS. The mean for the sample was 16.1 with the standard deviation of 4. Is there enough evidence to claim that there has been a significant change in the average level of anxiety since the 1980s? Conduct the appropriate statistical test (two- tailed) with a = .05. Based on the statistical evidence, can it be claimed that there has been a significant change in the average level of anxiety since the 1980s? No Yes
A random sample of 160 commercial customers revealed that 32 had paid their accounts within a month of billing. Can normality be assumed for the sample proportion?
In March 2016, it was reported that key American brands had increased their daily Instagram posts from 0.89 per day at the end of 2014 to 1.04 posts per day by the end of 2015. With consistent samples sizes of 10,000 each for December 2014 and December 2015, the sample standard deviation for 2014 was 6.5 posts per day and 5 posts per day in 2015. Julian Gottke, writing for Quintly, seemed to indicate that the increase from 0.89 posts per day to 1.04 posts per day was significant. To test whether this increase was statistically significant, a one-tail hypothesis test of the means of two independent populations using the t statistic was ordered. How would I set up my null and alternative hypothesis and determine the levels of significance and compute the test statistic?
in a test of a lifelong brand of tires , a survey revealed that the mean life was 35,000 mikes and the standard deviation was 7083 mikes. if the shape of the population distribution is known to be normal, approximately what percentage of the tires lasts less than 20834 miles ?
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