Let's go to the movies: A random sample of 44 Foreign Language movies made since 2000...
Let's go to the movies: A random sample of 42 Foreign Language movies made since 2000 had a mean length of 110.2 minutes, with a standard deviation of 12.3 minutes. Part: 0/2 Part 1 of 2 Construct a 90% confidence interval for the true mean length of all Foreign Language movies made since 2000. Round the answers to one decimal place. A 90% confidence interval for the true mean length of all Foreign Language movies made since 2000 is 0...
Fake Twitter followers: Many celebrities and public figures have Twitter accounts with large numbers of followers. However, some of these followers are fake, resulting from accounts generated by spamming computers. In a sample of 55 twitter audits, the mean percentage of fake followers was 13.1 with a standard deviation of 10.1. Part: 0 / 2 Part 1 of 2 (a) Construct an 80% confidence interval for the mean percentage of fake Twitter followers. Round the answers to at least one...
3) A random sample of 35 Hollywood movies made since the years 2010 had a mean length of 121.6 minutes, with a standard deviation of 20.4 minutes. a) Construct a 98% confidence interval for the true mean length of all Hollywood movies made since 2010. Interpret your answer. b) As of June 2013, three Ironman movies have been released, and their mean length is 127 minutes. Someone claims that the mean length of Ironman movies is less than the mean...
X Solved Fill in this blank with the > 2018/2019 Winter Break MAT115 E81- Distance Elementary Statistics, 2nd Ed Welco connect MATH Test #3 Chapter 8 Previous Next Question 6 of 8(1 point) View prolem.n..o Tables Fake Twitter fallowers: Mamy celebrities and public figures have Twitter accounts with large oumbers of followers However, some of these followers are fake, resulting from accounts geserated by spamming compaters. In a sample of 48 twitter audits, the mean percentage of take followers was...
Let’s go to the movies: A random sample of 35 Hollywood movies made in the last 10 years had a mean length of 125.2 minutes, with a standard deviation of 20.4 minutes. a. Construct a 95% confidence interval for the true mean length of all Hollywood movies made in the last 10 years. b. As of January 2017 there have been five movies released in the Bourne film series, and their mean length is 119.8 minutes. Someone claims that the...
Many celebrities and public figures have Twitter accounts with large numbers of followers. However, some of these followers are fake, resulting from accounts generated by spamming computers. In a sample of 53 twitter audits, the mean percentage of fake followers was 13.3 with a standard deviation of 9.8 a) Construct a 99.8% interval for the mean percentage of fake Twitter followers. Round the answers to one decimal place. .
A sample of size =n47 has sample mean x =57.6 and sample standard deviation =s9.5 . Part: 0 / 2 0 of 2 Parts Complete Part 1 of 2 Construct a 99.5% confidence interval for the population mean μ . Round the answers to one decimal place. A 99.5% confidence interval for the population mean is <<μ .
(C) If the confidence levels were 99.5% rather than 99.9% would the margin of error be larger or smaller than the result in part (a) ? Explain. The margin of error would be ( larger or smaller ) , since ( an increase or a decrease ) in the confidence level will ( decrease or increase ) the critical value z a/2. SAT scores: A college admissions officer takes a simple random sample of 100 entering freshmen and computes their...
How many computers? In a simple random sample of 185 households, the sample mean number of personal computer ls was 1.64. assume the population of the standard deviation is 0.47 a) construct a 99.9% confidence interval for the mean number of personal computers. round the answer to at least two decimal places. a 99.9% confidence interval for the mean number of personal computers is ---< mean <----- 2) In a sample of 75 clamps, the mean step to complete this...
9. A simple random sample of 37 weights of pennies made after 1983 has a sample mean of 2.4991 g and a known population standard deviation of 0.0165 g. a. Construct a 99% confidence interval estimate of the mean weight of all such pennies. b. Design specifications require a population mean of 2.5 g. What does the confidence interval suggest about the manufacturing process? 10. A random sample of 40 students has a mean annual earnings of $3120 and a...