Suppose the coffee industry claimed that the average adult drinks 1.7 cups of coffee per day. To test this claim, a random sample of 60 adults was selected, and theiraverage coffee consumption was found to be 1.85 cups per day. Assume the standard deviation of daily coffee consumption per day is 0.6 cups. Using a = 0.01.complete parts a and b below,a. Is the coffee industry's claim supported by this sample?Determine the null and alternative hypotheses.Ho: H - 1.7t H + 1.7to The z-test statistic is 1.94.ti (Round to two decimal places as needed.)sti The critical z-score(s) intare)(Round to two decimal places as needed. Use a comma to separate answers as needed.)

Answered: Image /qna-images/answer/4ccb6a7e-0827-4700-9ea1-cc01c5a31304.jpg

Answered: Suppose the coffee industry claimed…

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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Suppose a number of students are added to an original group of 6 students where all of whose ages are equal to the mean age of the original group. The standard deviation will: A. Increase B. Decrease C. Remain unchanged D. Cannot be determined
Suppose you buy a new car whose advertised mileage is 20 miles per gallon (mpg). After driving your car for several months, you find that its mileage is 16.5 mpg. You telephone the manufacturer and learn that the standard deviation of gas mileages for all cars of the model you bought is 1.02 mpg. a. Find the z-score for the gas mileage of your car, assuming the advertised claim is correct. b. Does it appear that your car is getting unusually low gas mileage? Question content area bottom Part 1 a. z=enter your response here (Round to two decimal places as needed.)
Weights of Adult Coho Salmon are normally distributed with a mean of 9.3pounds and a standard deviation of0.6pounds. a. What percent of these Salmonweigh no less than 10.0pounds? b. If 20 of these Salmon are chosen at random, what is the chance their average weight is no less than 10.0pounds? c. Find the 90thpercentilefor the weight of these salmon.
A researcher predicts that showing a certain film will change people’s attitudes toward alcohol. The researchers then randomly select 36 people, show them the film, and give them an attitude questionnaire. The mean score on the attitude questionnaire for this sample of people is 70. In the generalpopulation, the average score for people on this test is 75, with a standard deviation of 12 (assume the alpha level = .05). a. Identify the independent variable. b. Identify the dependent variable. c. In a sentence, state the null hypothesis. d. Using symbols, state the null hypothesis. e. Using symbols, state the alternative hypothesis. f. Conduct the hypothesis test using a two- tailed test with alpha = .05. g. What is your conclusion regarding the null hypothesis? Should you reject or fail to reject the null hypothesis? h. What can you conclude about the film and attitudes toward alcohol based on your hypothesis test results?
Assume that you have been provided the following information for a sample of cars The covariance between weight and miles per gallon is equal to -4.9 pound-miles. The standard deviation of the cars' mileages is 7.75. The standard deviation of the cars' weights is 0.94. Estimate the correlation coefficient to the first decimal place.
Assume that women have diastolic blood pressure measures that arenormally distributed with a mean of 69.9 mm Hg and a standard deviation of 8.8 mm Hg. a. A diastolic blood pressure level above 90 mm Hg is considered to be hypertension. What percentage of women have hypertension? b. If we randomly collect samples of women with 25 in each sample, what percentage of those samples have a mean above 90 mm Hg?
A statistics instructor claims that the mean score for all students on the first statistics exam is above 75. To test this claim, 20 students are selected at random. Their scores from the first exam had a mean of 78.2 with a standard deviation of 14.25. Test the claim that the mean score for all students on the first statistics exam is above 75. Use a = 0.01. Answer the following questions. a. Identify the claim and state the Ho and H1. b. Find the critical value. c. Calculate the test statistic. d. Make a decision to reject or fail to reject the Ho. e. Interpret the decision.
Consider the following service system. The average inter-arrival time is 10 minutes, and the standard deviation of the inter-arrival time is 10 minutes. The average processing time is 5 minutes with the standard deviation of the processing time being 6 minutes. What is the value of Iq? What is the value of I?
Use the following information for the question. The average travel time to work for a person living and working in Kokomo, Indiana is 17 minutes. Suppose the standard deviation of travel time to work is 4.5 minutes and the distribution of travel time is approximately normally distributed.Which of these statements is asking for a measurement (i. e. is an inverse normal question)? A.What percentage of people living and working in Kokomo have a travel time to work that is between thirteen and fifteen minutes? B.If 15% of people living and working in Kokomo have travel time to work that is below a certain number of minutes, how many minutes would that be?
Use z scores to compare the given values. Based on sample data, newborn males have weights with a mean of 3282.7 g and a standard deviation of 689.7 g. Newborn females have weights with a mean of 3017.5 g and a standard deviation of 722.2 g. Who has the weight that is more extreme relative to the group from which they came: a male who weighs 1500 g or a female who weighs 1500 g? Since the z score for the male is z = more extreme. (Round to two decimal places.) and the z score for the female is z = [ =, the has the weight that is
A fruit grower wants to test a new spray that a manufacturer claims will reduce the loss due to insect damage. She sprays 20 trees with the new spray and 20 trees with the standard spray. The following data were recorded: New Spray Standard Spray Mean yield per tree(lb) 240 227 Standard deviation 31.3 28.6 Do the data provide evidence that the new spray increases the yield per tree?
Assume that adults have IQ scores that are normally distributed with mean of 99.6 and a standard deviation 17.4. Find the first quartile Q,, which is the IQ score separating the bottom 25% from the top 75%. (Hint: Draw a graph.) The first quartile is (Type an integer or decimal rounded to one decimal place as needed.)

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