An online education platform monitors the average completiontime for its certification coursesmonthly. The management assertsthat the ideal completion time should not exceed 30 days.Giventhat the standard deviation of completion times is known to be 8days, and that the actualaverage completion time is 25 days. Howmany months of data should they collect under theseconditions, ifthey intend to conduct a study with 80% power at a 10%significance level?

The information is given as:Mean: daysTrue mean: daysStandard deviation: daysType 1 error :Power:…

Answered: An online education platform monitors…

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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Individual scores for practices towards COFLU-20 are found to be normally distributed with a mean of 3 and a standard deviation of 1.5 over the entire population. The Ministry of Health wishes to use this information to identify individuals whose score on practices towards COFLU20 is in the lower 75%, in order to give them relevant information on the best practices towards COFLU-20. You are asked to assist in calculating the score that the Ministry of Health should use to decide whether an individual should be given the relevant information?
You may need to use the appropriate technology to answer this question. A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive office (CEO) was at least nine years. A survey of companies reported in The Wall Street Journal found a sample mean tenure of x7.27 years for CEOs with a standard deviation of s- 6.38 years. (a) Formulate hypotheses that can be used to challenge the validity of the claim made by the shareholders' group. H29 (b) Assume 90 companies were included in the sample. What is the test statistic? (Round your answer to three decimal places.) 1356 x What is the p-value for your hypothesis test? (Round your answer to four decimal places.) p-value - 242 x (c) At a- 0.01, what is your conclusion? O Reject H We can conclude that the mean tenure of a CEO is significantly lower than 9 years. The claim of the shareholders group is not valid. O Do not reject Hg. We cannot conclude that the mean tenure of a CEO is significantly lower than 9…
Assume that adults have IQ scores that are normally distributed with a mean of μ=105 and a standard deviation σ=20. Find the probability that a randomly selected adult has an IQ less than 129. Click to view page 1 of the table. LOADING... Click to view page 2 of the table. LOADING... Question content area bottom Part 1 The probability that a randomly selected adult has an IQ less than 129 is enter your response here. (Type an integer or decimal rounded to four decimal places as needed.)
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Suppose two food preservatives are extensively tested and determined safe for use in meats. A processor wants to compare the preservatives for their effects on retarding spoilage. Suppose 16 cuts of fresh meat are treated with preservative A with mean 95.25 and Sample standard deviation 13.45. And another 12 cuts of meat are treated with preservative B with mean 100.50 and standard deviation 10.55. The number of hours until spoilage begins is recorded for each of the 28 cuts of meat. The value of the test statistic for determining if there is a difference in the population variances for preservatives A and B is equal to: A. 1.129. OB. 1.275. OC. 1.625. OD. 0.784.
Using traditional methods, it takes 11.7 hours to receive a basic driving license. A new license training method using Computer Aided Instruction (CAI) has been proposed. A researcher used the technique with 23 students and observed that they had a mean of 11.3 hours with a standard deviation of 1.4 A level of significance of 0.1 will be used to determine if the technique performs differently than the traditional method. Assume the population distribution is approximately normal. Make the decision to reject or fail to reject the null hypothesis. Is it reject null hypothesis or fail to reject null hypothesis
Using traditional methods, it takes 98 hours to receive a basic driving license. A new license training method using Computer Aided Instruction (CAI) has been proposed. A researcher used the technique with 270 students and observed that they had a mean of 97 hours. Assume the standard deviation is known to be 7. A level of significance of 0.1 will be used to determine if the technique performs differently than the traditional method. Is there sufficient evidence to support the claim that the technique performs differently than the traditional method? What is the conclusion?
Unlike most packaged food products, alcohol beverage container labels are not required to show calorie or nutrient content. An article reported on a pilot study in which each of 55 individuals in a sample was asked to estimate the calorie content of a 12 oz can of beer known to contain 153 calories. The resulting sample mean estimated calorie level was 193 and the sample standard deviation was 88. Does this data suggest that the true average estimated calorie content in the population sampled exceeds the actual content? Test the appropriate hypotheses at significance level 0.001. State the appropriate null and alternative hypotheses. Ho: μ = 153 Ha: μ> 153 Ho: μ = 153 Ha: μ = 153 Ho: μ = 153 Ha: μ ≤ 153 Ho: μ = 153 Ha: μ< 153 Calculate the test statistic and determine the P-value. (Round your test statistic to two decimal places and your P-value to four decimal places.) Z = P-value = State the conclusion in the problem context. O Reject the null hypothesis. There is sufficient evidence…

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