Write the null and alternative hypotheses for the following example. Determine if it is a case of a two-tailed, a left-tailed, or a right- tailed test. To test whether the mean starting salary of college graduates differs from 49,000 dollars per year. Ho:H v 49000 dollars > H1:H 49000 dollars This is a

Write the null and alternative hypotheses for the following example. Determine if it is a case of a two-tailed, a left-tailed, or a right- tailed test. To test whether the mean starting salary of college graduates differs from 49,000 dollars per year. Ho:H v 49000 dollars > H1:H 49000 dollars This is a

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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You want to by a typist for a local company. As part of the application process, they have you type for one minute 36 times. You did this and they found that you typed an average of 49 words per minute with a standard deviation of 5 words. Their policy is that they hire people who type 50 words per minute, so you did not make the cut. The boss of the company calls you in and says that you barely missed the cut and wants to offer you an opportunity to show that you should be hired. You say, "Lets test the idea that I have a mean typing rate of 50 words per minute against the hypothesis that I type less than 50 words per minute. If our Ho is not rejected." Your boss is impressed and tells you to run the test. Run the test and tell me if you get the job. I apply for the same job and type 20 words per minute with a standard deviation of 5 words in my 36 timed trials. I make the same pitch that you did. How many more words per minute would I need to have typed in order to get the job?
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Peter, a statistics teacher in a community college, randomly selected thirty-five students in his class to complete an assigned task, the sample mean completion time is found. Using this x, Peter found that the 95% confidence interval for the true average time in completing the task is (17.278, 28.722) minutes. Peter thinks that this interval is too wide, that means the speed of students doing an in-class exercise has to be improved. Therefore, he thinks a confidence interval of total width 5 minutes will be more desirable. (Hints: width of C.I. = upper limit minus lower limit) (a) Using the same value of x, find the new confidence interval in this case. (b) Find the confidence level for the interval in part (a).
An auto magazine wants to review the tread mileage wear of two sports tires. We will compare the average tread wear before replacement between Micheline and Pirelli. As we don’t know which brand as a higher average treadwear we will use a two-tailed test. The magazine randomly samples 44 Micheline tires and they had an average treadwear of 20,000 miles before replacement, with a standard deviation of 2,000 miles. There was a random sample of 48 Pirelli tires. The average tread wear of the 48 Pirelli tires was 21,000 miles with a standard deviation of 2,000 miles. Define the first population as the Micheline tires and the second population as the Pirelli tires. Using a 5% significance level determine if the brand competitors do not have an average equal tread wear. Give the hypothesis, the reject region, test statistic, and conclusion.
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Which one of type one and type two error is more severe and why
A cognitive psychologist believes that a particular drug improves short term memory. And experiment is conducted in which he randomly selected participants are then tested for retention 15 minutes after the memorization. The number of words correctly recalled by each participant is as follows eight, nine, 10, six, eight, seven, nine, seven, seven. Over the past few years, the psychologist has collected a lot of data using this task with similar participants and the average word correctly recall was six words and the standard deviation is to. Answer the below questions using a=0.05 tail. What is the alternative hypothesis? What is the null hypothesis? What inferential test is being conducted? What is the obtained statistic? What is the critical value? What is your decision? what is your conclusion? what is your effect size? what error might you be making?
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Are there more words in the English language That start with an "r" OR For which "r" is the third letter How do you calculate these statistical hypothesis?
Please help find the test statistic, the p-value of the test, if we reject the null, and if there is sufficient evidence or not, why
Prof. X has been monitoring all stats students' anxiety levels by covertly measuring micro-expressions with in-class video surveillance during each exam (including this one!). Prof. X wants to determine if anxiety levels differed across the three exams. Which statistical test should be used? Select one: a. One-way between subjects ANOVA Incorrect b. One-way repeated measures ANOVA c. Two-way between subjects ANOVA d. None of these options
What are the left and right chi-squared test value for a 2 tailed test at a 99% confidence level when n = 8?