Last Spring, a couple of my Oxbow students, Izzy and Hannah, studied thehow long it took customers at Hannafords to get through a self-checkout linecompared to waiting through the Quick Checkout (12 items or less) register.Hannafords' management claims the mean wait time for the self-checkout isless than the established mean wait time of 4.7 minutes using the QuickCheckout line. They allowed the sisters to do some data collection, perform astatistical analysis on their results and report back to them about what theyfound. Management is interested in increasing the number of self-checkoutregisters if there is evidence that the registers decrease customers wait times.They will not need as many people working register and save in payroll costs.Hannah and Izzy collected data during three 5pm - 5:30pm times on randomdays. The results from 40 customers had a mean wait time of 4.4 minutes witha standard deviation of 0.6 minute.Keep this information for use in the next problem.For this part of the exercise, what is the sample size "n" for their sample?40 Using the information from the last question about Izzyand Hannah:1. Write a pair of null and alternative hypotheses.2. In this context describe a Type I error and the impactsuch an error would have on customer's wait times.3. In this context describe a Type Il error and theimpact such an error would have on the store.4. Conduct an appropriate test of significance to testmanagement's claim5. Your job is to write a paragraph using plain Englishto advise Hannaford's whether this reduction in waittimes was statistically significant. Avoid statisticalvocabulary. Management does not want to readabout p-values for example.

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Answered: Using the information from the last…

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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Problems (show ALL of your work and follow all 5 steps for hypothesis testing. Please try to put your official, organized answers in the spaces I have provided for you). 17. For 6 months we worked with a group of 15 severely mentally handicapped individuals in an attempt to teach them self-care through imitation. For a second 6-month period, we used physically guided practice with the same individuals. For each 6-month session, we collected ratings on the level of required assistance (high = bad) for each person. The data for each individual follows (on the next page). Was the assistance significantly reduced in the second 6-month period? (use alpha=0.05) %3D Subject # Imitation 1 3 4. 6. 7. 8. 9. 10 11 12 13 14 15 14 11 19 8. 4 6. 12 14 17 18 0. 8. 6. Physical guidance 10 13 15 6. 9. 16 10 13 1 6. Hint: D Hint: D
6.
Symbolically state the alternative hypotheses for the following claim: The mean salary for licensed vocational nurses in Texas is under $50,000. Symbolically state the alternative hypotheses for the following claim: The mean salary for licensed vocational nurses in Texas is under $50,000. μ ≥ 50000 μ < 50000 p < 50000 p ≥ 50000
3. A drug considered unsafe if more than 5% of the patients develop serious side effects. In order to study the safety of a new drug, a Company tests the following null and alternative hypotheses. H :T 0.05: Discuss the type I and Type II error in this situation. Is this a good test? Explain. a
A local teacher wants to see if teaching writing in different ways impacts student learning. She has two classes of similar characteristics. In one class, she will use Teaching Strategy A and in the other class she will use Teaching Strategy B. She ran her analysis in Microsoft Excel and received the following output table. If the P value is less than 0.05, the null hypothesis may be rejected. Based on the data table, what decision should the teacher make about the hypothesis?
A consumer product testing organization uses a survey of readers to obtain customer satisfaction ratings for the nation's largest supermarkets. Each survey respondent is asked to rate a specified supermarket based on a variety of factors such as: quality of products, selection, value, checkout efficiency, service, and store layout. An overall satisfaction score summarizes the rating for each respondent with 100 meaning the respondent is completely satisfied in terms of all factors. Suppose sample data representative of independent samples of two supermarkets' customers are shown below. Supermarket 1 Supermarket 2 n = 260 n, = 300 = 84 X, = 83 (a) Formulate the null and alternative hypotheses to test whether there is a difference between the population mean customer satisfaction scores for the two retailers. (Let u, = the population mean satisfaction score for Supermarket 1's customers, and let u, = the population mean satisfaction score for Supermarket 2's customers. Enter != for as…
unrest and violence on one southern campus had decreased by 62% from 10 years ago. four out of then americans brush their teeth daily. which of the following is true regarding these two statements? a. these statements are derived from inductive statistics b. all of the given statements are sample parameters rather than population statistics. c. statistics, from one of it definitions, constitutes a collection of such statements. d. these types of statements are usually found to be exampls of lying with statistics. e. nonof these is correct.
A manager wonders if there is a relationship between customers' class (U1-U4) and their primary visit reason.Based on the Cross-tab analysis result in Table 1, what would you tell to the manager? see attached analysis table
The last part of the question, the options are: sufficient OR insufficient; support OR do not support. Thx!
Consider the patients who went to the Urgent Care at the local hospital last week as the observational units (people we are studying) in a statistical study. a) Identify two categorical/qualitative variables that could be recorded on these observational units. b) Identify two numerical/quantitative variables that could be recorded on these observational units. c) State a research question that you could investigate about these observational units, using at least one of the variables that you gave in part a) and b).
need b,c ,d not A
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