Math 534 week Study guides, Class notes & Summaries

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. In a hypothesis test,the test statistic computed from the sample data is considered extreme or significant if it is . 2. Atestofthehypotheses,H0:p=0.18andH1:p≠0.18isa 3. Ananalysttestedthenullhypothesisµ≥30againstthealternativehypothesis that µ <30. The analyst reported a p-value of 0.07. Forwhatsignificancelevelofαwill the nullhypothesis wouldberejected?

1. Question: Suppose you are an operations manager for a plant that manufactures batteries. Give an example of how you could use descriptive statistics to make better managerial decisions. Give an example of how you could use inferential statistics to make better managerial decisions.Say whether this or that example describes the use of descriptive or inferential statistics. 2. Question: Classify each of the following as nominal, ordinal, interval, or ratio data. 3. Question: For the following...

Acompanywantstolearnthecustomers’purchasehabitsofbuyingcertainproducts.Thiscompanydidasurveyaboutarandom1000customers,whowereaskedaboutthetimestheypurchasedthecertain products within one month. Then what is the data in thisexample:

MATH 534 Week 8 Discussion The descriptive statistics summarize data from a sample, for example, demographicprofiles. Whenever there are several groups, it is useful to provide the descriptivestatistics by group and for the overall sample. This gives a visual impression of thecomparabilityofthe groupsin termoftheir baseline characteristics.Itis notnecessaryto report statistical tests and P-values in such a summary because the main concern isthe comparability of the participants (which reflect...

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: 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: A random sample of 100 selected from a population with a standard deviation of 10 yielded a mean = 225. The mean and the standard deviation of the distribution of the sample means are __________. 2. Question: Suppose a random sample of 49 is selected from a population of size N = 500 with a standard deviation of 14. If the sample mean is 125, the 99% confidence interval to estimate the population mean is between ____________. 3. Question: A manufacturer wants to purchase a certain...

The descriptive statistics summarize data from a sample, for example, demographicprofiles. Whenever there are several groups, it is useful to provide the descriptivestatistics by group and for the overall sample. This gives a visual impression of thecomparabilityofthe groupsin termoftheir baseline characteristics.Itis notnecessaryto report statistical tests and P-values in such a summary because the main concern isthe comparability of the participants (which reflects the sampling), not the popul...

MATH 534 Week 5 Discussion; Hypothesis Testing