18191/cfi/468!/4/4@0.00:55.8 u. Repea preccomg nypoIesIS est usIIng e Cicar van approacn. 16. Credit Card Use by Undergraduates. In a study entitled How Undergraduate Stu- dents Use Credit Cards, it was reported that undergraduate students have a mean credit card balance of $3173. This figure was an all-time high and had increased 44% over the previous five years. Assume that a current study is being conducted to determine if it can be concluded that the mean credit card balance for undergraduate students has continued to increase compared to the original report. Based on previous studies, use a population standard deviation o $1000. a. State the null and alternative hypotheses. b. What is the p-value for a sample of 180 undergraduate students with a sample mean credit card balance of $3325? c. Using a .05 level of significance, what is your conclusion? 17. Use of Texting. TextRequest reports that adults 18-24 years old send and receive 128 texts every day. Suppose we take a sample of 25-34 year olds to see if their mean number of daily texts differs from the mean for 18-24 year olds reported by TextRequest. a. State the null and alternative hypotheses we should use to test whether the popu- lation mean daily number of texts for 25-34 year olds differs from the population daily mean number of texts for 18-24 year olds. b. Suppose a sample of thirty 25-34 year olds showed a sample mean of 118.6 texts per day. Assume a population standard deviation of 33.17 texts per day and com- pute the p-value. c. With a = .05 as the level of significance, what is your conclusion? d. Repeat the preceding hypothesis test using the critical value approach. 18. CPA Work Hours. The American Institute of Certified Tax Planners reports that the average U.S. CPA works 60 hours per week during tax season. Do CPAS in states that We've updated our read aloud Give it a try here. Aa gage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-202 ar Bnconod Ma not hscooiad eranned r dunlihata in halo rin nart s ta elactranie riahte sama third nartu enntsnt may ha cunnraccad fram tha aRonk andAF A

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Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.