A company owned two small stores in different cities. It was desired to see if there wasa difference in their mean daily sales. The following results were obtained from arandom sample of daily sales over a six-week period. At a = 0.01, can a difference insales be concluded? Use the P-value method.Population StandardStoreMeanSample SizeDeviationA99512030112025030

Answered: Image /qna-images/answer/3cd0a04f-3af6-42e1-8c96-e70762a014f9.jpg

Answered: A company owned two small stores in…

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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Consider the following data and answer the following questions. Monthly Sales (OMR): 25,000 30,000 35,000 45,000 40,000 50,000 20,000 What is the Inter Quartile Range of sales? What is the Quartile Deviation of sales? What is the coefficient of Quartile Deviation of weekly sales?
Below are the SPSS results of a related (dependent) samples t-test. Use the SPSS results to answer Questions 5, 6, and 7. Paired Samples Statistics Mean N Std. Deviation Std. Error Mean Pair 1 Statistics Posttest 57.1250 40 16.73962 2.64677 Statistics Pretest 49.9250 40 15.09014 2.38596 Paired Samples Test Paired Differences t df Sig. (2-tailed) Mean Std. Deviation Std. Error Mean Pair 1 Statistics Posttest - Statistics Pretest 7.200 12.313 ( a ) ( b ) ( c ) .001 Find the mean of the differences ( and standard deviation of the differences (Sd). Replace “a,” “b,” and “c” in the table above with the correct values. Round to the third decimal place. Do you think there is a statistically significant difference between the pretest and posttest at the .05 level of significance?
Please provide solution asap.And mention final answer justified
Listed below are prices in dollars for one night at different hotels in a certain region. Find the range, variance, and standard deviation for the given sample data. Include appropriate units in the results. How useful are the measures of variation for someone searching for a room? 240 82 93 259 88 192 86 264 Question content area bottom Part 1 The range of the sample data is 182182 dollars.dollars. (Round to one decimal place as needed.) Part 2 The standard deviation of the sample data is 83.883.8 dollars.dollars. (Round to one decimal place as needed.) Part 3 The variance of the sample data is enter your response here ▼ nights squared .nights2. nights.nights. dollars squared .dollars2. dollars.dollars. (Round to one decimal place as needed.)
Choose the appropriate statistical test. When computing, be sure to round each answer as indicated. A dentist wonders if depression affects ratings of tooth pain. In the general population, using a scale of 1-10 with higher values indicating more pain, the average pain rating for patients with toothaches is 6.8. A sample of 30 patients that show high levels of depression have an average pain rating of 7.1 (variance 0.8). What should the dentist determine? 1. Calculate the estimated standard error. (round to 3 decimals). [st.error] 2. What is thet-obtained? (round to 3 decimals). 3. What is the t-cv? (exact value) 4. What is your conclusion? Only type "Reject" or Retain"
If there is significantly more variability between samples than within samples , this tends to be indicative of : 1 use of an inefficient study design. 2. actual mean differences attributed to the factor. 3. incidental differences attributed to samplig error. 4. actual variance difference attribute to different samples.
The coefficient of variation (CV) measures the dispersion of the data relative to the sample mean. Suppose the sample mean of a particular variable is 550 and the sample variance is 6400. What is the CV? O 32.6% O 1.163.6% O 10.7% O 14.5%
Given below are the analysis of variance results from a Minitab display. Assume that you want to use a 0.05 significance level in testing the null hypothesis that the different samples come from populations with the same mean. Identify the value of the test statistic. Source DF MS F Factor 3 13.500 4.500 5.17 0.011 Error 16 13.925 0.870 Total 19 27.425 Seleccione una: O A. 5.17 О В. 0.011 O C. 4.500 O D. 13.500
The ages of undergraduate students at two universities (one in the east and one in the west) are being compared. Researchers want to know if there is a difference in the mean age of students at the two universities. The population standard deviations are known. The following data shows the results of samples collected at each institution: School Location n (sample size) sample mean ( ) population standard deviation West 33 25.78 6.29 East 35 23.16 7.52 What is the value of the test statistic for the previous problem? (Enter your answer as a positive value even if you calculated a negative test statistic value i.e. if you calculated -1.311 you should enter 1.311). Round your answer to 3 decimal places.
Consider the following set of data: Law students Engineering students Sample Size 107 160 Mean $53.20 $72.76 Standard Deviation $2.67 $3.12 What is the correct degrees of freedom to use in the t test to determine whether there is evidence of a difference in the population means between the Law students and Engineering students?

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