Math534 Study guides, Class notes & Summaries

A company makes men's button-up dress shirts and is considering changes to itsdesign.Howmightthecompanygoaboutfindingagoodsampleofindividuals?Thesedecisions would include method of sampling, location of sampling, population toconsider,and numberin sample,inaddition toanyotherconsiderations.

A company makes men's button-up dress shirts and is considering changes to its design. Howmight the company go about finding a good sample of individuals? These decisions wouldincludemethodofsampling,locationofsampling,populationtoconsider,andnumberinsample,in additionto any other considerations.

1. Question: Classify each of the following as nominal, ordinal, interval, or ratio data. 2. Question: The activity or the process of collecting the data on the population is called . 3. Question: A company wants to learn the customers’ purchase habits of buying certain products. This company did a survey about a random 1000 customers, who were asked about the times they purchased the certain products within one month. Then what is the data in this example: 4. Question: Researchers often wi...

1. Question: A value of -1 for the coefficient of correlation between two variables means that the two variables are _____________. 2. Question: If there is positive correlation between two sets of numbers, then ____________-. 3. Question: If the correlation coefficient between variables X and Y is roughly zero, then ___________. 4. Question: Determine the Pearson product-moment correlation coefficient for the following data. 5. Question: A quality manager is developing a regression model to...

Part B: Hypothesis Testing and ConfidenceIntervals Completethefollowingfourhypotheses,usingα=0.05foreach.Theweek5spreadsheetcanbeusedintheseanalyses. ▪ 1.Meansalesperweekexceed42.5persalesperson ▪ 2.Proportionreceivingonlinetrainingislessthan 55% ▪ 3Meancallsmadeamongthosewithnotraining isatleast 145 ▪ 4.Meantime percallis14.7minutes • Using the same data set from part A, perform the hypothesis test for each speculation inordertoseeifthereisevidencetosupportthemanager's...

1. Question: Scores on a certain exam are normally distributed with a mean of 90 and a variance of 25. What is the z-value for a score of 80? 2. Question: Scores on a certain exam are normally distributed with a mean of 90 and a variance of 25. What is the probability of obtaining a score less than 80? 3. Question: Which one of the following is not a characteristic of a normal distribution? 4. Question: If the z-value of a given x value is positive, it means that ___________. 5. Question: As...

Introduction Your instructor will provide you with a data file that includes data on five variables: SALES represents the number sales made this week. CALLS represents the number of sales calls made this week. TIME represents the average time per call this week. YEARS represents years of experience in the call center. TYPE represents the type of training the employee received. Part A: Exploratory Data Analysis Preparation • Open the files for the Course Project and the data set. • ...

1. Question: In a hypothesis test, the test statistic computed from the sample data is considered extreme or significant if it is __________ 2. Question: A test of the hypotheses, H0: p = 0.18 and H1: p ≠ 0.18 is a _______________. 3. Question: An analyst tested the null hypothesis µ ≥ 30 against the alternative hypothesis that µ < 30. The analyst reported a p-value of 0.07. For what significance level of α will the null hypothesis would be rejected? 4. Question: The dean of a busi...

1. Question: Given a random variable X follows a Normal distribution with mean 10 and standard deviation 2. Question: Scores on a certain exam are normally distributed with a mean of 90 and a variance of 25. 3. Question: A normal distribution is defined by two parameters, the mean and the Standard Deviation 4. Question: If for a certain x value in a normal distribution with mean equal to 4 the z-value is such that Larger than 4 5. Question: Suppose X is normally distributed with mean 50 and ...