An analyst of EDSA Sang Hotel sampled 20 customers from last year's records and found out that themean sale per customer was $500 with a standard deviation of $110. A random sample of 25 customersfrom this year's record yielded an average sale per customer of $540 with a standard deviation of S125.Assuming the sales per customer are normally distributed, can we conclude that there has been asignificant change in the average sales per customer?n₁1₂dft =t =X1X₂alpha(₁-x₂)-(μ₁ −μ₂)s₁² (m − 1) + s₂² (m₂ − 1) 1 11+1₂2=2Vm1₂S₁S₂t2alpha/2.df

The question is about t test for difference between two pop. means Given : Sample no. of customers…

Answered: An analyst of EDSA Sang Hotel sampled…

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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Similar questions

In a survey, the mean weight of 1005 rats was calculated to be 132 gr. The standard deviation of the observation was found to be s=3 gr. Determine at least how many of the surveyed rats have a weight between 124.5 and 139.5 gr.
Why do you need to know the sampling distribution of the difference between two sample means in order to perform a hypothesis test to compare two population means?
A 1995 study shows that since records were first kept in a meteorologist's hometown, the average temperature during the month of May was u=68 degrees. The meteorologist then looks up the average temperatures for each of the 25 Mays since then, and finds their sample mean to be x= 73 and their standard deviation to be s= 8.55 degrees. Can the meteorologist claim that the average temperatures for May is different from how it used to be? Use a 1% level of significance. What is the null hypothesis and the alternate hypothesis? Is the test is left tailed, right tailed, or two tailed? What is the P value? What is the comparison between the P-value and the a-value given? Do we reject or accept the null hypothesis?
In a random sample of 6 cell phones, the mean full retail price was $547.30 and the standard deviation was $176.00. Further research suggests that the population mean is $428.25. Does the t-value for the original sample fall between and to.95? Assume that the population of full retail prices for cell phones is normally distributed. - to.95 The t-value of t = fall between -1 -to.95 and to. .95 because to 95 = (Round to two decimal places as needed.)
Mason earned a score of 226 on Exam A that had a mean of 250 and a standard deviation of 40. He is about to take Exam B that has a mean of 550 and a standard deviation of 25. How well must Mason score on Exam B in order to do equivalently well as he did on Exam A? Assume that scores on each exam are normally distributed.
Suppose that, for a certain mathematics class, the scores are normally distributed with a mean of 75 and a standard deviation of 9. The teacher wishes to give A's to the top 5% of the students and F's to the bottom 5%. The next 15% in either direction will be given B's and D's, with the other students receiving C's. Find the bottom cutoff for receiving an A grade. (You may need to use the standard normal distribution table. Round your answer to the nearest whole number.)
For all students who have taken a certain class during the last ten years, theaverage on the mid-term is 83.4 and the standard deviation of the mid-termscores is 7.2; the average on the final is 79.3 and the standard deviation of thescores on the final is 5.1; the correlation between scores on the mid-term andscores on the final is 0.86. 4. My teacher has lost our mid-term scores (but at least has our scores onthe final), so she is fitting a straight line to guess what we probably got onthe mid-term. What’s the equation of the line she is using? 5. I got a 90 on the final. What does my teacher think I got on the midterm?
Suppose the mean monthly return on a T-Bill is 0.5% with a standard deviation of 0.58%. Sup-pose we have another investment Y with a 1.5% mean monthly return and standard deviationof 6%. Which of the two investments o ers less risk in terms of investment.
The owner of a local nightclub has recently surveyed a random sample of n = 250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30. If so, she plans to alter the entertainment to appeal to an older crowd. If not, no entertainment changes will be made. Suppose she found that the sample mean was 30.45 years and the sample standard deviation was 5 years. What is the p value associated with the test statistic?
Suppose a population is known to be normally distributed with a mean, μ, equal to 116 and a standard deviation, σ, equal to 14. Approximately what percent of the population would be between 130 and 144?
Suppose a population is known to be normally distributed with a mean, μ, equal to 144 and a standard deviation, σ, equal to 27. Approximately what percent of the population would be between 90 and 198?
1) Use the data in the following table, which lists drive-thru order accuracy at popular fast food chains. Assume the orders are randomly selected from those included in the table. A B C D OrderAccurate 310 262 247 144 Oder Not Accurate 35 55 33 17 If one order is selected,find the probability of getting an order from Restaurant A or an order that is accurate. Are the events of selecting an order from Restaurant A and selecting an accurate order disjoint events? a) The probability of getting an order from Restaurant A or an order that is accurate is (round to three decimal places as needed)

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