The life spans of a species of fruit fly have a bell-shaped distribution, with a mean of 34 days and a standard deviation of 5 days. (a) The life spans of three randomly selected fruit flies are 38 days, 32 days, and 46 days. Find the z-score that corresponds to each life span. Determine whether an of these life spans are unusual. (b) The life spans of three randomly selected fruit flies are 39 days, 44 days, and 24 days. Using the Empirical Rule, find the percentile that corresponds to each life span. (a) The z-score corresponding a life span of 38 days is (Type an integer or a decimal rounded to two decimal places as needed.) The z-score corresponding a life span of 32 days is (Type an integer or a decimal rounded to two decimal places as needed.) The z-score corresponding a life span of 46 days is (Type an integer or a decimal rounded to two decimal places as needed.) Select all of the life spans that are unusual. O A. 46 days O B. 38 days

The life spans of a species of fruit fly have a bell-shaped distribution, with a mean of 34 days and a standard deviation of 5 days. (a) The life spans of three randomly selected fruit flies are 38 days, 32 days, and 46 days. Find the z-score that corresponds to each life span. Determine whether an of these life spans are unusual. (b) The life spans of three randomly selected fruit flies are 39 days, 44 days, and 24 days. Using the Empirical Rule, find the percentile that corresponds to each life span. (a) The z-score corresponding a life span of 38 days is (Type an integer or a decimal rounded to two decimal places as needed.) The z-score corresponding a life span of 32 days is (Type an integer or a decimal rounded to two decimal places as needed.) The z-score corresponding a life span of 46 days is (Type an integer or a decimal rounded to two decimal places as needed.) Select all of the life spans that are unusual. O A. 46 days O B. 38 days

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

The average score of the students of a certain class in a 100-item quiz is 83 with a standard deviation of 2.5. What is the coefficient of variation?
Five students took a self-confidence test. Their deviation scores were –4, +3, +1, –2, and +2. Assuming that these scores com form a normaldistribution, which deviation represents the highest raw score?
You may need to use the appropriate technology to answer this question. Data were collected on the top 1,000 financial advisers. Company A had 239 people on the list and another company, Company B, had 121 people on the list. A sample of 16 of the advisers from Company A and 10 of the advisers from Company B showed that the advisers managed many very large accounts with a large variance in the total amount of funds managed. The standard deviation of the amount managed by advisers from Company A was s₁ = $583 million. The standard deviation of the amount managed by advisers from Company B was s₂ = $484 million. Conduct a hypothesis test at a = 0.10 to determine if there is a significant difference in the population variances for the amounts managed by the two companies. What is your conclusion about the variability in the amount of funds managed by advisers from the two firms? State the null and alternative hypotheses. 2 2 H₂:0 2 Find the value of the test statistic. (Round your answer…
A taxi company operates in two different regions, and it is analyzing the prices of rides in those regions. It has compiled the prices (in dollars) of 101 rides in each of the two regions during the last week. The histograms below show the distributions of the two data sets. Each histogram shows price (in dollars) on the horizontal axis and the number of taxi rides on the vertical axis. The means and standard deviations for the data sets are also given. Region A 25- 20+ 15+ 10+ 5+ 1₂ 0.5 5.5 10.5 15.5 20.5 25.5 30.5 35.5 40.5 45.5 50.5 Region A mean: $25.28 Region A standard deviation: $7.95 25 Expl 20- 15+ 10+ neck 5+ 0A 0.5 5.5 5.5 10.5 15.5 20.5 25.5 30.5 35.5 40.5 45.5 50.5 (a) Identify the data set for which it is appropriate to use the Empirical Rule. It is appropriate to use the Empirical Rule for the (Choose one) data set. The company wants to use the Empirical Rule to make some approximations about both data sets. Unfortunately, it is appropriate to use the Empirical Rule on…
A company conducted a survey on the number of hours employees spend on a particular task per week. The data collected from a sample of 10 employees are as follows: 5, 6, 7, 8, 9, 10, 10, 11, 12, 13. Calculate the standard deviation of the hours spent on the task per week.
Fran is training for her first marathon, and she wants to know if there is a significant difference between the mean number of miles run each week by group runners and individual runners who are training for marathons. She interviews 42 randomly selected people who train in groups and finds that they run a mean of 47.1 miles per week. Assume that the population standard deviation for group runners is known to be 4.4 miles per week. She also interviews a random sample of 47 people who train on their own and finds that they run a mean of 48.5 miles per week. Assume that the population standard deviation for people who run by themselves is 1.8 miles per week. Test the claim at the 0.01 level of significance. Let group runners training for marathons be Population 1 and let individual runners training for marathons be Population 2. Step 2 of 3 : Compute the value of the test statistic. Round your answer to two decimal places.
A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 99.3-cm and a standard deviation of 1.5-cm. For shipment, 25 steel rods are bundled together.Find P27, which is the average length separating the smallest 27% bundles from the largest 73% bundles. P27 =
Two students were informed that they received standard z-scores of 0.9 and -0.5, respectively on a multiple-choice examination in Science. If their grades were 95 and 60, respectively, find the mean and standard deviation of the examination grades.
A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 119.5-cm and a standard deviation of 2.2-cm. For shipment, 24 steel rods are bundled together.Find P75, which is the average length separating the smallest 75% bundles from the largest 25% bundles.P75 = -cm
The daily number of bad checks received by a large department store in a random sample of 5 days out of the past year was 67, 76, 72, 84, and 76. Find the Standard deviation.
The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million and a standard deviation of $2 million. The salaries of professional football players are also heavily skewed right with a mean of $1.9 million and a standard deviation of $1.5 million. A random sample of 40 baseball players’ salaries and 35 football players’ salaries is selected. The mean salary is determined for both samples. Let represent the difference in the mean salaries for baseball and football players. Which of the following represents the shape of the sampling distribution for ? skewed right since the populations are both right skewed skewed right since the differences in salaries cannot be negative approximately Normal since both sample sizes are greater than 30 approximately Normal since the sum of the sample sizes is greater than 30