Please answer correctly 2. Suppose a survey of a random sample of 150 smokers, conducted by the Department ofHealth, suggests that the mean number of cigarettes a person smokes in a day inSmokerland Y is 4 and the standard deviation Sy is 1. The Department of Health isconcerned about the results of the survey and wants to test whether the mean number ofcigarettes a person smokes in a day is 3.70 or not. Suppose the Department of Health usesa 5% significance level,Suppose the Department of Health decides not to reject the null hypothesis if[ (Ho) if 3.5 < y < 3.9].What is the size of the test?If μy is 4.1, what is the Power of the test(15 points)(15 points)

1. What is the size of the test?The size of the test, also known as the significance level α, is the…

Answered: 2. Suppose a survey of a random sample…

ENGR.ECONOMIC ANALYSIS

14th Edition

ISBN:9780190931919

Author:NEWNAN

Publisher:NEWNAN

Chapter1: Making Economics Decisions

Section: Chapter Questions

Problem 1QTC

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p The Graduate Management Admission Test (GMAT) is a standardized exam used by many universities as part of the assessment for admission to graduate study in business. The average GMAT score is 547 (Magoosh website). Assume that GMAT scores are bell-shaped with a standard deviation of 100. Use the empirical rule to answer the following. a. What percentage of GMAT scores are 647 or higher (to 1 decimal)? % b. What percentage of GMAT scores are 747 or higher (to 1 decimal)? c. What percentage of GMAT scores are between 447 and 547 (to 1 decimal)? d. What percentage of GMAT scores are between 347 and 647 (to 1 decimal)?
Suppose that the distribution of Uber rides around the quoted arrival time is normally distributed. Themean waiting time (relative to the quoted time) is 0, with a standard deviation of 3 minutes.a. Using the empirical rule, what percentage of rides arrive within 3 minutes of the mean (3 minutesbefore to 3 minutes after)?b. Graphically depict the area that would need to be calculated to determine the probability ofwaiting more than 4 minutes for a ride. Explain your graph.
In one of its Spring catalogs, L.L. Bean advertised footwear on 29 of its 192 catalog pages. Suppose we randomly surgery 20 pages. We are interested in the number of pages that advertise footwear. Each page may be picked at most once. Calculate the standard deviation
The results of a national survey showed that on average, adults sleep 6.9 hours per night. Suppose that the standard deviation is 1.2 hours. Round your answers to the nearest whole number. Use Chebyshev's theorem to calculate the percentage of individuals who sleep between 4.5 and 9.3 hours. At least Use Chebyshev's theorem to calculate the percentage of individuals who sleep between 3.9 and 9.9 hours. At least Assume that the number of hours of sleep follows a bell-shaped distribution. Use the empirical rule to calculate the percentage of individuals who sleep between 4.5 and 9.3 hours per day. At least How does this result compare to the value that you obtained using Chebyshev's theorem in part (a)?
ou would like to get the highest paying job possible after graduating from UCR and are currently deciding vhether to enroll in ECON 108 in the fall term or not. You find a sample of recent UCR graduates that majc n Economics (there are no double majors in the samples). You sampled 100 Economics majors that took ECON 108 and you find that the average starting salary is 72K dollars, with a sample standard deviation of 10K dollars. You sampled 75 Economics majors that did not take ECON 108 and you find that the average starting salary is 65K dollars, with a sample standard deviation of 15K dollars. Which of the following statements is most correct? O I am not very confident in the results of my hypothesis test because the range in which I fail to reject the null hypothesis is relatively large. O I want to be very confident in the results of my hypothesis test, so the range in which I fail to reject the null hypothesis is relatively large. O The range in which I fail to reject is small, so…
Show your work A stenographer claims that she can take dictation at the rate of 120 words per minute. Can we reject her claim on the basis of 100 trials in which she demonstrates a mean of 116 words with a standard deviation of 15 words? Use 5 per cent level of significance.
Compute the Posterior Probabilities by completing the table
A study of the effect of television commercials on 12-year-old children measured their attention span, in seconds. The commercials were for ciothes, food, and toys. Clothes Food 24 Toys 48 24 25 30 40 36 22 35 42 51 22 33 61 35 55 15 32 42 es 23 27 64 53 34 36 20 42 57 25 18 33 30 a. Complete the ANOVA table. Use 0.02 significance level. (Round the SS and MS values to 1 decimal place and Fvalue to 2 decimal places. Round the DF values to nearest whole number. Round p-value to 3 decimal places.) Source KS P-Value Factor Error Total b. Find the values of mean and standard deviation. (Round the mean and standard deviation values to 3 decimal places.) Level Hean SEDev clothes Pood Toya
18. An insurance agent has claimed that the average age of policy-holders who insure through him is less than the average for all agents, which is 30-5 years. A random sample of 100 policy-holders who had insured through him gave the following age distribution : Age last birthday 16-20 21-25 26-30 31-35 36-40 No. of persons 12 22 20 30 16 : Calculate the arithmetic mean and standard deviation of this distribution and use these values to test his claim at the 5% level of significance. You are given that Z (1-645) = (0-95.
SCCoast, an Internet provider in the Southeast, developed the following frequency distribution on the age of Internet users. Find the mean and the standard deviation. (Round squared deviations to nearest whole number and final answer to 2 decimal places.) Age (years) Frequency 10 up to 20 3 20 up to 30 7 30 up to 40 18 40 up to 50 20 50 up to 60 12
The average marks on an Economics Assignment is 55%, with a standard deviation of 5%. The Examiners note that the distribution of the marks is normal. A. Define 'Normal Distribution' including key properties and illustrate with a diagram. What is the proportion of frequencies below 35%? What is the proportion of frequencies above 80%? What is the proportion of marks between 40% and 70% ?
The annual salary of the staff members in a state government agency are shown here. The first column shows the annual salary (S) and the second column the frequency (the number of employees earning that salary) labeled F. The mean salary of agency's staff is: S F $120,000 1 91,000 2 86,000 4 65,000 10 57,500 24 44,000 10 a $61,098 b $60,195 c $59,306 d $58,429

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