Facebook Friends Many people believe that the average number of Facebook friends is 140. The population standard deviation is 39.6. A random sample of 30high school students in a particular county revealed that the average number of Facebook friends was 147. At a=0.10, is there sufficient evidence to concludethat the mean number of friends is greater than 140? Use the P-value method. Use a graphing calculator.Part 1 of 4(a) State the hypotheses and identify the claim.Ho: 140 not claimH₁>140 claimThis hypothesis test is a one-tailedPart: 1/4Part 2 of 4test.(b) Find the P-value. Round the answer to at least four decimal places.P-value=

Consider that μ is the population number of Facebook friends.

Answered: acebook Friends Many people believe…

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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Assume the average selling price for houses in a certain county is $308,000 with a standard deviation of $57, 000. Using Chebychev's Theorem, determine the range of prices that includes at least 91% of the homes around the mean.
Head Start is an enrichment program for young children. The program’s administrators would like to know if this program is successful in increasing the intelligence (IQ) of its participants. They know that the IQs of children who enter the program have a mean of 88 and a standard deviation of 15 points. A sample of eighty students has an average IQ of 88.8. Has the program increased the students’ IQs?
Entry to a certain University is determined by a national test. The scores on this test are normally distributed with a mean of 500 and a standard deviation of 100. Tom wants to be admitted to this university and he knows that he must score better than at least 80% of the students who took the test. Tom takes the test and scores 595. Will he be admitted to this university?
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DATAfile: Costco You may need to use the appropriate technology to answer this question. Consumer Reports uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with the satisfaction rating score, a population standard deviation of ? = 13 is expected. In 2012, Costco, with its 432 warehouses in 40 states, was the only chain store to earn an outstanding rating for overall quality. A sample of 15 Costco customer satisfaction scores follows. 95 90 83 75 95 98 80 83 82 93 86 80 94 64 62 (a) What is the sample mean customer satisfaction score for Costco? (b) What is the sample variance? (Round your answer to two decimal places.) (c) What is the sample standard deviation? (Round your answer to two decimal places.) (d) Construct a hypothesis test to determine whether the population standard deviation of ? = 13 should be rejected for Costco. With a 0.05 level of significance, what is your conclusion?…
A vending machine dispenses coffee into a twelve-ounce cup. The amount of coffee dispensed into the cup is normally distributed with a standard deviation of 0.04 ounce. You can allow the cup to overfil 3% of the time. What amount should you set as the mean amount of coffee to be dispensed? Cik to View ongn 1.o the table Click to view. Dagn 2.of the tabin. Dounces (Round to two decimal places as needed.)
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A survey of 64 randomly selected homeowners find that they spend a mean of $62 per month on home maintenance. Construct a 90% competitive interval for the mean amount of money spent per month on home maintenance by all homeowners. Assume that the population standard deviation is $14 per month. Round to the nearest cent

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