A random sample of 100 students showed that the average height is 168cm with a standarddeviation of 15 cm.Test if the population mean is equal to 160 cm. Use alpha =0.05.What type of test is suited for this problem? [Select]What is the test statistic value? [ Select ]Is the null hypothesis rejected? [Select]

Answered: Image /qna-images/answer/f73d4dfe-17f9-49f8-a7cc-d1a047bcc8c8.jpg

Answered: A random sample of 100 students showed…

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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A lumber company is making boards that are 2568.0 millimeters tall. If the boards are too long they must be trimmed, and if they are too short they cannot be used. A sample of 39 boards is made, and it is found that they have a mean of 2567.4 millimeters. Assume the standard deviation is known to be 8.0. Is there evidence at the 0.01 level that the boards are too short and unusable? Step 4 of 5 : Enter the decision rule.
Among private universities in the United States, the mean ratio of students to professors is 35.2 (i.e., 35.2 students for each professor) with a standard deviation of 8.8. Suppose a random sample of 50 universities is selected and the observed mean student-to-professor ratio is 38. Is there evidence that the reported mean ratio actually exceeds 35.2? Use  = 0.05 and conduct the appropriate hypothesis test. ( See attached picture )
A population has parameters u = 62.9 and o = 101. 57.3. You intend to draw a random sample of size n = What is the mean of the distribution of sample means? What is the standard deviation of the distribution of sample means? (Report answer accurate to 2 decimal places.) Question Help: D Video D Post to forum Submit Question
Currently patrons at the library speak at an average of 66 decibels. Will this average decline after the installation of a new computer plug in station? After the plug in station was built, the librarian randomly recorded 66 people speaking at the library. Their average decibel level was 63.2 and their standard deviation was 18. What can be concluded at the the a = 0.10 level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Ho: ?v Select an answer v Hị: Select an answer c. The test statistic ? v (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 4 decimal places.) e. The p-value is ? va f. Based on this, we should Select an answer g. Thus, the final conclusion is that ... | the null hypothesis. OThe data suggest that the population mean decibal level has not significantly decreased from 66 at a = 0.10, so there is statistically insignificant evidence to conclude that the…
Eye Color Based on a study by Dr. R Sorita at Indiana University, assume that 12% of us have green eyes. In a study of 650 people, it is found that 86 of them have green eyes. a. Find the probability of at least 86 people with green eyes among 650 randomly selected people. b. Is 86 people with green eyes significantly high?
The mean score on a driving exam for a group of driver’s education students is 76 points, with a standard deviation of 6 points. Apply chebychev’s theorem to the data using K=2. Interpret, At least ___% of the exam score falls between ___and ____
A researcher claimed that for people that smoke cigarettes, the average number of cigarettes smoked per day is greater than 9. To test her claim, she selected a random sample of 36 smokers and found the mean number of cigarettes smoked per day was 10. The standard deviation of the population is 2.5 cigarettes. At a = 0.05, conduct all steps of a hypothesis test to test the researcher's claim.
A lumber company is making boards that are 2900 millimeters tall. If the boards are too long they must be trimmed, and if they are too short they cannot be used. A sample of 35 boards is taken, and it is found that they have a mean of 2900.3 millimeters. Assume a population standard deviation of 8. Is there evidence at the 0.01 level that the boards are either too long or too short? Step 2 of 3 : Find the P-value for the hypothesis test. Round your answer to four decimal places.
The mean SAT score in mathematics is 588. The standard deviation of these scores is 47. A special preparation course claims that it's graduates will score higher on average than the mean score 588. A random sample of 150 students completed the course, and their mean SAT score in mathematics was 591. At the 0.1 level of significance,can we conclude that the preparation course does what it claims? Assume that the standard deviation is also 47. Perform a one tailed test
Research suggests a link between mothers alcohol consumption with the birth weight of newborns. Random sampke of 100 mothers who drank during pregnancy, average birth weight od their babies is 7.2 lbs. Average birth weight nationwide is 7.8 lbs. And standard deviation is 1.56. Do mothers who drink have babiea that are significantly smaller compared to nationwide? Use alpha = 01. A. State the null abd the research hypothesisB. Identify the critical values of z or t used to define the decision ruleC. Calculate the test statisticD. Report the p-valueE. Report your findings
Using traditional methods it takes 107 hours to receive an advanced flying license. A new training technique using Computer Aided Instruction (CAI) has been proposed. A researcher used the technique on 150 students and observed that they had a mean of 106 hours. Assume the population standard deviation is known to be 5 . Is there evidence at the 0.01 level that the technique performs differently than the traditional method? Step 1 of 6 : State the null and alternative hypotheses.

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