Q.8.2The CEO of Global Investment Funds claims that, on average, clients leave theirinvestment funds with the company for a period of at least/56 months.Test this claim at the 10% significance level, if it was found that a sample of 29 clientsleft their investment funds with the company for an average period of 58.85 months,with a standard deviation of 3.75 months.

Given data : sample size, n =29 sample mean, x̄ = 58.85 sample standard deviation,s=…

Answered: Q.8.2 The CEO of Global Investment…

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 college entrance exam company determined that a score of 24 on the mathematics portion of the exam suggests that a student is ready for college-level mathematics. To achieve this goal, the company recommends that students take a core curriculum of math courses in high school. Suppose a random sample of 250 students who completed this core set of courses results in a mean math score of 24.4 on the college entrance exam with a standard deviation of 3.1. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 24 on the mathematics portion of the exam? Complete parts a) through d) below. a) State the appropriate null and alternative hypotheses. Fill in the correct answers below. The appropriate null and alternative hypotheses are Ho V versus H₁: 4 Help me solve this View an example Get more help. Check answer D # Type here to search 1:18 PM ## 6/18/2022 77 Q $ 4 D V 96 5 T B Oi 0 6 Y H N U 8 M hp K a…
A college entrance exam company determined that a score of 22 on the mathematics portion of the exam suggests that a student is ready for college-level mathematics. To achieve this goal, the company recommends that students take a core curriculum of math courses in high school. Suppose a random sample of 150 students who completed this core set of courses results in a mean math score of 22.4 on the college entrance exam with a standard deviation of 3.8. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 22 on the math portion of the exam? Complete parts a) through d) below.
For a new study conducted by a fitness magazine, 280 females were randomly selected. For each, the mean daily calorie consumption was calculated for a September-February period. A second sample of 240 females was chosen independently of the first. For each of them, the mean daily calorie consumption was calculated for a March-August period. During the September-February period, participants consumed a mean of 2385.7 calories daily with a standard deviation of 210. During the March-August period, participants consumed a mean of 2414.3 calories daily with a standard deviation of 285. The population standard deviations of daily calories consumed for females in the two periods can be estimated using the sample standard deviations, as the samples that were used to compute them were quite large. Construct a 90% confidence interval for u, -u,, the difference between the mean daily calorie consumption u, of females in September-February and the mean daily calorie consumption u, of females in…
A biologist who studies spiders believes that not only do female green lynx spiders tend to be longer than their male counterparts but also that the lengths of the females vary more than those of the male spiders. To investigate the latter (second) belief, she obtained a random sample of 9 male spiders which yielded a mean length of 6.828 cm and a standard deviation of 0.617 cm as well as a random sample of 10 female spiders which yielded a mean length of 8.917 cm and a standard deviation of 1.27 cm. Do the data support the biologist’s claim if a significance level of 5% is used? Let X be the length of the male spiders and let Y be the length of the female spiders. Complete the following by providing the values requested and selecting the most appropriate option, where applicable.
In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-shaped and has a mean of 40 and a standard deviation of 4. Using the empirical rule, what is the approximate percentage of daily phone calls numbering between 32 and 48?
Suppose the mean wait-time for a telephone reservation agent at a large airline is 45 seconds. A manager with the airline is concerned that business may be lost due to customers having to wait too long for an agent. To address this concern, the manager develops new airline reservation policies that are intended to reduce the amount of time an agent needs to spend with each customer. A random sample of 250 customers results in a sample mean wait-time of 44.4 seconds with a standard deviation of 4.2 seconds. Using a = 0.05 level of significance, do you believe the new policies were effective in reducing wait time? Do you think the results have any practical significance? Determine the null and alternative hypotheses. Ho: H₁: ▼ = ▼ Calculate the test statistic. 45 seconds 45 seconds (Round to two decimal places as needed.) Calculate the P-value. P-value= (Round to three decimal places as needed.) State the conclusion for the test. OA. Reject Ho because the P-value is less than the a= 0.05…
he manager of a computer retails store is concerned that his suppliers have been giving him laptop computers with lower than average quality. His research shows that replacement times for the model laptop of concern are normally distributed with a mean of 3.1 years and a standard deviation of 0.6 years. He then randomly selects records on 36 laptops sold in the past and finds that the mean replacement time is 2.9 years.Assuming that the laptop replacement times have a mean of 3.1 years and a standard deviation of 0.6 years, find the probability that 36 randomly selected laptops will have a mean replacement time of 2.9 years or less. P(M < 2.9 years) = Incorrect Enter your answer as a number accurate to 4 decimal places. NOTE: Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.
A college entrance exam company determined that a score of 23 on the mathematics portion of the exam suggests that a student is ready for college-level mathematics. To achieve this goal, the company recommends that students take a core curriculum of math courses in high school. Suppose a random sample of 200 students who completed this core set of courses results in a mean math score of 23.8 on the college entrance exam with a standard deviation of 3.6. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 23 on the math portion of the exam? Complete parts a) through d) below. Click the icon to view the table of critical t-values. a) State the appropriate null and alternative hypotheses. Fill in the correct answers below. The appropriate null and alternative hypotheses are Ho: versus H,:
Suppose that Jerry (a baker) wants to find a 95% Confidence Interval for the mean baking time for all of his cider donuts. He takes a random sample of 40 cider donuts over the course of several weeks. He found that the average baking time of the sample was 16.4 minutes with a standard deviation of 2.2 minutes. d. Suppose Jose, another donut maker, states that his cider donuts have a mean baking time of 15 minutes. Is there evidence at the 95% confidence level, to support the claim that the true mean baking times for Jerry’s and Jose’s cider donuts are different? Justify. e. Suppose Lee, another donut maker, states that her cider donuts have a mean baking time of 17 minutes. Is there evidence at the 95% confidence level, to support the claim that the true mean baking times for Jerry’s and Lee’s cider donuts are different? Justify.
A baseball team claims that the mean length of its games is 2.4 hours. State H0 and Ha in words and in symbols. Then determine whether the hypothesis test for this claim is left-tailed, right-tailed, or two-tailed. Explain your reasoning. State the null hypothesis in words and in symbols. Choose the correct answer below. A. The null hypothesis expressed in words is, "the mean length of a baseball team's games is at most 2.4 hours." The null hypothesis is expressed symbolically as, "H0: μ≤2.4." B. The null hypothesis expressed in words is, "the mean length of a baseball team's games is more than 2.4 hours." The null hypothesis is expressed symbolically as, "H0: μ≠2.4." C. The null hypothesis expressed in words is, "the mean length of a baseball team's games is at least 2.4 hours." The null hypothesis is expressed symbolically as, "H0: μ≥2.4." D. The null hypothesis expressed in words is, "the mean length of a baseball…
2. A pain reliever currently being used in a hospital is known to bring relief in a mean time of 3.5 minutes. To compare a new pain reliever with the one currently being used, a random sample of 45 patients is given the new drug. The mean time to relief for this sample is 2.8 minutes with a standard deviation of 1.14 minutes. a) Test the research (alternative) hypothesis that the new drug is more effective than the old drug, using α ≤ .05. b) Assuming a standard deviation of 1.14 minutes, approximately how large a sample of patients would be needed to form a 90% confidence interval to estimate the population time-to-relief of the new drug accurate to within plus or minus 10 seconds? Answers: 2. a) Z = -4.12, reject H0, new drug is more effective, b) 127
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