rary > MAT 240: Applied Statistics home >pothesis tests for the difference between two population meansA company that develops an automated customer service model is interested in knowing whether two versions,Version A and Version B, will get different ratings from customers. Participants in a focus group are taken throughsamples from both versions, then take a survey to rate each version. A summary of the data obtained from thestudy is given below. Assume ratings from the different surveys generally have the same standard deviation.Version A Version BMean39.33334.4ObservationsPearson Correlation-0.0110Hypothesized Mean Difference-2.086P(T<=t) one-tail0.028p = 0.176It Critical one-tail-2.624P(T<=t) two-tail0.056t Critical two-tail-2.977Confidence Level2213t = -1.4261.426n = 15Degrees of freedom: df 14Point estimate for Version A: 1 33.133Point estimate for Version B: 0₂28.671CheckNext7É HOJUzyBooks catalog > H

Answered: A company that develops an automated…

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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Which of the following is NOT one of the three common errors involving correlation? Question content area bottom Part 1 Choose the correct answer below. A. Correlation does not imply causality B. The conclusion that correlation implies causality C. Mistaking no linear correlation with no correlation D. The use of data based on averages
Why should researchers taught to be cautious when interpreting a correlation?
compare ihe altenuance al lNe res for a Saturday evening performance. He knows the mean and standard deviations for each theatre's usual attendance. Since the theatres have different seating capacity, he wants to use their relative measure of attendance as the basis for comparison. Using the information in the table below, which theatre has the relatively better attendance for a Saturday evening performance? Goodman Steppenwolf 454 Attendance 417 Mean St.dev. 383 34 438 20 a) What is Goodman's z-score? b) What is Steppenwolf's z-score? c) Which has better attendance?
BANK OF COMMERCE IS STUDYING THE RELATIONSHIP BETWEEN THE MEAN ACCOUNT BALANCE FOR INDIVIDUAL ACCOUNTS AND THE NUMBER OF TRANSACTIONS PER MONTH. AS SAMPLE OF EIGHT REVEALED: CUSTOMER 1 2 3 4 7 MEAN BALANCE 50 32 53 24 15 10 16 27 (PO00S) NO. OF 5 2 7 9 10 4 11 TRANSACTIONS FIND THE COEFFICIENTS OF CORRELATION. DETERMINE AT THE O.01 SIGNIFICANCE LEVEL WHETHER THE CORRELATION IN THE POPULATION IS GREATER THAN ZERO STEP 1. STEP 2 STEP 3 STEP 4
A school principal claims that the number of students who are tardy to school does not vary from month to month. A survey over the school year produced the following results. Using a 0.01 level of significance, test a teacher's claim that the number of tardy students does vary by the month. Number Aug. Oct. Sept. 18 13 19 Tardy Students Nov. Dec. Jan. 14 8 Feb. Mar. Apr. 6 13 11 15 May 16 Copy Data Step 2 of 4: Calculate the expected value for the number of tardies in October. Enter your answer as a fraction or a decimal rounded to three decimal places.
A school principal claims that the number of students who are tardy to school does not vary from month to month. A survey over the school year produced the following results. Using a 0.01 level of significance, test a teacher's claim that the number of tardy students does vary by the month. Number Aug. Sept. Oct. 18 13 19 Tardy Students Nov. 14 Dec. Jan. Feb. Mar. Apr. May 8 6 13 11 15 16 Copy Data Step 3 of 4: Compute the value of the test statistic. Round any intermediate calculations to at least six decimal places, and round your final answer to three decimal places.
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Answer part c and d frq styled
In running a Pearson correlation, you notice that there are a few outliers. Please describe the next course of action, if any, for the dataset and explain your reasoning.
The following data represent the results from an independent-measures study comparing itwo treatment conditions. Test at 0.05 level of significance to determine whether there is a significant mean difference between the two treatments. Use 4 decimal places.Treatment I Treatment II 8 2 7 3 6 3 5 5 9 2STATISTICS = _____COMPUTED VALUE = _____TABULAR VALUE = _____CONCLUSION = _____
6
Fuel efficiency of Prius: Fueleconomy.gov, the official US government source for fuel economy information, allows users to share gas mileage information on their vehicles. The histogram below shows the distribution of gas mileage in miles per gallon (MPG) from 14 users who drive a 2012 Toyota Prius. The sample mean is 53.3 MPG and the standard deviation is 5.2 MPG. Note that these data are user estimates and since the source data cannot be verified, the accuracy of these estimates are not guaranteed. (a) The EPA claims that a 2012 Prius gets 50 MPG (city and highway mileage combined). Do these data provide strong evidence against this estimate for drivers who participate on fueleconomy.gov? The test statistic is: __________________(please round to two decimal places)The p-value:___________________________ for this hypothesis test is: (please round to four decimal places)(c) Please comment on the primary thing that is wrong about the following statement: There is sufficient evidence…

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