During the Lazhopee 11-11 event, itwas observed that male users wereshopping most often for mobileaccessories. Hence, it is of interest toknow whether the sex is associatedto the category of the item bought. Arandom sample of 500 users wereobtained and their sex and thecategory of the item bought wasrecorded.Suppose that a p-value lessthan 0.0001 was obtainedusing the appropriate test,which of the followingstatement(s) is(are) TRUE?I. The appropriate test to use isPearson's Chi-Square Test ofIndependence.II. There is sufficient evidence to sayO that sex is associated to thecategory of the item bought.Both I and IINeither I nor II

Here's, we know that there are 500 users.we will check independency between them. We will use…

Answered: During the Lazhopee 11-11 event, it was…

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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US Universities found that 72% of people are concerned about the possibility that their personal records could be stolen over the internet. If a random sample of 300 college students at a Midwestern university were taken and 228 of them were concerned about the possibility that their personal records could be stolen over the Internet, could you conclude at the 0.025 level of significance that a higher proportion of the university’s college students are concerned about Internet theft than the public at large? Report the p-value for this test. Z0.025 = 1.96
A cellphone provider has the business objective of wanting to determine the proportion of subscribers who would upgrade to a new cellphone with improved features if it were made available at a substantially reduced cost. Data are collected from a random sample of 500 subscribers. The results indicate that 135 of the subscribers would upgrade to a new cellphone at a reduced cost. At the 0.05 level of significance, is there evidence that more than 20% of the customers would upgrade to a new cellphone at a reduced cost? How would the manager in charge of promotional programs concerning residential customers use the results in (a)?
A computer manufacturing company claims that its brand - A computers outsells its brand - by 10 % . It is found that 40 out of a random sample of 200 users prefer brand - A and 18 of another sample of 100 users prefer brand - B Test at 5 % level of significance whether the 10 difference is a valid claim .
According to a certain government agency for a large country, the proportion of fatal traffic accidents in the country in which the driver had a positive blood alcohol concentration (BAC) is 0.33.Suppose a random sample of 109 traffic fatalities in a certain region results in 47that involved a positive BAC. Does the sample evidence suggest that the region has a higher proportion of traffic fatalities involving a positive BAC than the country at the α=0.05 level of significance?
A survey of 30 r/s students in a large college indicated that 19 of them held off-campus jobs. Does this survey result provide strong evidence that more than 50% of all studentsin this college hold off-campus jobs? Use an appropriate p-value to draw and explain your conclusion.
A recent report indicated that families in a certain country typically spend about $175 per week on groceries. To investigate whether families in a certain city typically spend more than $175 per week, an economist selected a random sample of 500 families in the city and found the sample mean to be $176.24. With all conditions for inference met, a hypothesis test resulted in a pp-value of 0.0021. At the significance level of α=0.05α=0.05, which of the following is a correct conclusion? The p-value is less than 0.05, and the null hypothesis is rejected. There is convincing statistical evidence that the mean is greater than $175. The p-value is less than 0.05, and the null hypothesis is not rejected. There is convincing statistical evidence that the mean is greater than $175. The p-value is less than 0.05, and the null hypothesis is not rejected. There is not convincing statistical evidence that the mean is greater than $175. The p-value is greater than 0.05,…
A drapery store manager was interested in determining whether a new employee can install vertical blinds faster than an employee who has been with the company for two years. The manager takes independent samples of 10 records of installations times of vertical blinds of each of the two employees and computes the following information. Test whether the new employee installs vertical blinds faster, on the average, than the veteran employee, at the level of significance 0.05. New Employee Veteran Employee Sample Size 10 10 Sample Mean installation time 22.2 min 24.8 min Sample Standard Deviation installation time 0.90 min 0.75 min Let m1 = true average time takes a new employee to install vertical blinds and m2 = true average time takes a veteran employee to install vertical blinds Group of answer choices A. H0: m1 - m2 = 0, Ha: m1-m2 is not equal to 0 Since the observed value of the test statistics in absolute value is 7.02 which is greater than 2.101, we can conclude…
A researcher carries out a QLR test using 30% trimming, and there areq = 5 restrictions. Answer the following questions, using the values of (“Critical Values of the QLR Statistic with 15% Trimming”)and (“Critical Values of the Fm,∞ Distribution”).a. The QLR F-statistic is 3.9. Should the researcher reject the nullhypothesis at the 5% level?b. The QLR F-statistic is 1.1. Should the researcher reject the nullhypothesis at the 5% level?c. The QLR F-statistic is 3.6. Should the researcher reject the nullhypothesis at the 5% level?
A sample poll of 500 voters from Michigan and 300 voters from Wisconsin showed that 51% and 49% is in favor of Donald Trump, respectively. At a significance level of 0.05, and using two-tailed test: a.) What should be the good hypotheses? b.) What is the t-value/z-value? c.) Is there is a difference between the two states?

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