DQuestion 12You wish to estimate the average weight of frogs in a certain pond. You plan to randomly sampleN frogs and estimate their average weight (X) and construct a 95% confidence interval. Assumethe standard deviation (0) in weight between individual frogs is approximately equal to 1.3 grams.How large a sample do you need so that the margin of error for your confidence interval is at most0.25 grams?ON= 500O Cannot be DeterminedON= 180ON= 104ON= 250

We have given that, Margin of error (E) = 0.25, population standard deviation (σ) = 1.3 and…

Answered: Question 12 You wish to estimate the…

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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Suppose a certain species bird has an average weight of x = 3.2 grams. Based on previous studies we can assume that the weights of these birds have a normal distribution with sigma = 0.34 grams. For a small group of 18 birds , find a 98% confidence interval for the average weights of these birds. Write answer in interval notation with two decimal places.
QUESTION 5 It was found that the mean annual turnover rate of the Aspirin medicine bottle is 23. The management think that the mean is changed. Therefore, a random sample of 93 is chosen that shows the average is 13 and the standard deviation is 6. Use 0.05 significance level to test this claim. Based on the above, the test statistic is equal to? (Round answer to two decimal places ex. 2.09)
Question 6 In a sample of 450 adults, 284 had children. Construct a 90% confidence interval for the true population proportion of adults with children. Give your answers as decimals, to three places
QUESTION 18 In a bakery, a sample of 19 days was taken to study the daily sales. It was found that the mean daily sales are 124 with a sample standard deviation is 68. The 98 percent upper confidence limit for the population mean a daily sale would be? (Round answer to two decimal places ex. 2.09)
QUESTION 1 Suppose we are trying to calculate a 99% confidence interval for a population mean height of children ages 5 to 10 in the United States. To do this, we use a sample of size 180 children between 5 and 10. From that sarmple, we get a sample mean of 104 cm and a sample standard deviation of 11.5 cm. What critical number do we need to use to make this confidence interval? Use StatCrunch and round your answer to 3 decimal places. QUESTION 2 uct a 15% confilence interval for a one sample population proportion Suppose you ae planning to Through use of StatCrunch, what would the value of your critical number need to be? QUESTION 3
Question 7 Isabella wants to advertise how many chocolate chips are in each Big Chip cookie at her bakery. She randomly selects a sample of 41 cookies and finds that the number of chocolate chips per cookie in the sample has a mean of 11.4 and a standard deviation of 1.3. What is the 99% confidence interval for the number of chocolate chips per cookie for Big Chip cookies? Assume the data is from a normally distributed population. Round answers to 3 decimal places where possible.
Question 6 Karen wants to advertise how many chocolate chips are in each Big Chip cookie at her bakery. She randomly selects a sample of 41 cookies and finds that the number of chocolate chips per cookie in the sample has a mean of 14.3 and a standard deviation of 2.2. What is the 90% confidence interval for the number of chocolate chips per cookie for Big Chip cookies? Enter your answers accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). Submit Question
Question 3 You measure 24 textbooks' weights, and find they have a mean weight of 35 ounces. Assume the population standard deviation is 9 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places Calculator > <μ<
Question 5, 8.3.49
Question 12 Astudent was asked to find a 90% confidence interval for the proportion of students who take notes using data from a random sample of size n = 86. Which of the following is a correct interpretation of the interval 0.13 p < 0.27? Check all that are correct. With 90% confidence, the proportion of all students who take notes is between 0.13 and0.27. U There is a 90% chance that the proportion of the population is between 0.13 and 0.27. O There is a 90% chance that the proportion of notetakers in a sample of 86 students wilL be between 0.13 and 0.27. O The proprtion of all students who take notes is between 0.13 and 0.27, 90% of the time. OWith 90% confidence, a randomly selected student takes notes in a proportion of their classes that is between 0.13 and 0.27.
QUESTION 7 Your statistics instructor wants you to determine a confidence interval estimate for the mean test score. Past experience indicated that tests scores are normally distributed with a sample mean of 160 and a population standard deviation of 45. The critical value to estimate a 95% confidence interval of the population means is A. 1.645 B. 1.96 OC. 2.021 D. 1.684
QUESTION 9 Nabisco claims that Chip Ahoy Cookies have an x ̅=28.67 chocolate chips per cookie with a SD=2.67. You randomly select 15 cookies from a new bag and carefully remove all the chocolate chips from each of the 36 cookies. You find the mean of the chocolate chips for the 15 cookies is 24.27 chocolate chips per cookie. Calculate the 99% confidence interval LOWER bound for the chocolate chips in your experiment. (round to the nearest hundredth).

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