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Is the mean billing cycle time shorter at the branch with a new billing process? When to use a hypothesis test Use a hypothesis test to make inferences about one or more populations when sample data are available. This is an example On average, is a call center meeting the target time to of Statistical Inference, which is using information about a answer customer questions?ħ Sample to make an Inference about a population. Is the service at one branch better than the service at For example, to test whether the mean duration of a another? transaction is equal to the desired target, measure the duration of a sample of transactions and use its sample mean For example, to estimate the mean for all transactions. One-Sample t-Test Hypothesis testing What is a hypothesis test Why use a hypothesis test A hypothesis test uses sample data to test a hypothesis about Hypothesis testing can help answer questions such as: the population from which the sample was taken.Ħ The Are turn-around times meeting or exceeding customer one-sample t-test is one of many procedures available for expectations? hypothesis testing in Minitab. Statistical Inference and t-Tests Copyright 2010 Minitab Inc. Variable Description Data collection Date Date of customer notification A financial analyst randomly selects 6 loan applications from Hours Number of hours until customer receives the past 2 weeks and manually calculates the time between notification loan initiation and when the customer receives the institution's decision.
#NORMALITY TEST MINITAB SERIES#
A financial services Normality test institution wants to establish a baseline for their process by Time series plot estimating their mean processing time.ĥ They also want to determine if their mean time differs from a competitor's claim of 6 hours. One-Sample t-Test One-Sample t-Test Example 1 Mortgage Process Time Problem Tools A faster loan processing time produces higher productivity 1-Sample t and greater customer satisfaction.
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Choosing an Analysis Choosing an Analysis Statistical Inference and t-Tests Copyright 2010 Minitab Inc. Car Satisfaction Ratings satisfaction ratings one week and one year after customers purchase the car.Ĥ Statistical Inference and t-Tests Copyright 2010 Minitab Inc. ATM Surrounds installation of shelters Exercise D Use a paired t-test to compare the difference in car 1-49. Contents Examples and Exercises Purpose Page Paired t-Test Example 4 Evaluate the difference in ATM usage before and after 1-43.
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Salary Comparison neighborhoods with a two-sample t-test. Call Center Handling Times using a two-sample t-test.ģ Exercise C Compare the difference in household salaries in two 1-42. Exercise B Compare the difference in call center handling times 1-41. Customer Complaints complaints using a two-sample t-test. Evaluating Power Two-Sample t-Test Example 3 Evaluate the differences in the mean number of customer 1-29. Power and Sample Size Example 2 Assess the power of a hypothesis test. Surgical Scheduling Time a target value using a one-sample t-test. Exercise A Evaluate the difference between mean surgical time and 1-19. Contents Contents Examples and Exercises Purpose Page Choosing an Analysis Example 1 Evaluate the difference between mean mortgage 1-5.Ģ Mortgage Process Time processing time and a target value using a one-sample t-test. Evaluate the differences between paired observations using a paired t-test. Evaluate the difference between two sample means using a two-sample t-test. Assess the power of a hypothesis test using power analysis. Evaluate the difference between a sample mean and a target value using a confidence interval. Statistical Inference and t-Tests Objectives Evaluate the difference between a sample mean and a target value using a one-sample t-test.