5. It is observed that randomly chosen 40 students out of 100 have a daily reading habit. Construct a confidence interval for the proportion of the consistent readers in the sample with a 95% confidence level.

Q: 6. If your boss in order to save money decreases the sample size, what will happen to the width of…

A: The width of the confidence interval is the difference of lower limit and upper limit of a…

Q: Suppose a consumer advocacy group wants to conduct a survey to find if the proportion of consumers…

A:

Q: Compute the margin of error of the 90% confidence level when a = 3 and n= 30

A: Given that  ?=3 , n=30 Formula for margin of error  E=Zc*?/√(n)

Q: 3. A survey of 2,950 Filipinos showed that 2,655 trust the Supreme Court decisions on legal issues.…

A: Let X be the number of trust the supreme court decision on legal issues  n be the sample size  Given…

Q: If a school district takes a random sample of 80 Math SAT scores and finds that the average is 421,…

A:

Q: suppose that we want a 95% confidence interval for π = proportion of defectives if we observe 4…

A: Given that, there are 4 defectives in 60 items tested. n=60 and x=4 Proportion of defective is given…

Q: A sample of 100 homes in city A and 100 homes in City B was taken to estimate the proportion of the…

A: Given that, A sample of 100 homes in city A and 100 homes in city B were taken to estimate the…

Q: The internal auditing staff of a local manufacturing company performs a sample audit each quarter to…

A:

Q: If a school district takes a random sample of 75 Math SAT scores and finds that the average is 433,…

A:

Q: When 38 campers are randomly selected and surveyed, it was found that the average number that prefer…

A: The summary of statistics is, x¯=24,σ=10.7,n=38 Critical values: By using the z-tables, the critical…

Q: 1. A survey is conducted among 254 students in a state university. It found that 48% of the students…

A: Given: Sample proportionp^=0.48Number of trials (n)=254

Q: 6. A food snack manufacturer samples 7 bags of pretzels off the assembly line and weighs their…

A: The confidence interval measure the range where the true population parameter exist. If the…

Q: .

A: It is given that 800 out of 1,000 students use Facebook during class.The sample proportion is…

Q: is 10. Construct a 96% confidence interval to estimate the population mean. What is the point…

A: Here n = 37 N =200 X bar = 68

Q: If 73.3% of the 45 students in our class are under the age of 20, find the 95% confidence interval…

A: Given, p = 0.733 n = 45 1 - α = 0.95α = 0.05α2 = 0.025     To find, 95% confidence interval for the…

Q: From the scores in subject statistics for 8 students, it was found that the mean score is 73 and the…

A: We have given that,  Sample mean (x̄) = 73,  standard deviation (s) = 5.15 and sample size (n) = 8…

Q: If a school district takes a random sample of 75 Math SAT scores and finds that the average is 433,…

A: It is given that the mean is 433 and the population standard deviation is 100.

Q: 9. The Centers for Disease Control and Prevention reported a survey of randomly selected Americans…

A:

Q: If you think a data point is an outlier, what test can you perform to see if you should omit the…

A: Given that the number of data points in the set is 8.

Q: If a school district takes a random sample of 80 Math SAT scores and finds that the average is 497,…

A:

Q: If a school district takes a random sample of 89 Math SAT scores and finds that the average is 497,…

A: From the provided information, Sample size (n) = 89 Sample mean (x̅) = 497 Population standard…

Q: In a survey of 3473 adults aged 57 through 85​ years, it was found that 84.6% of them used at least…

A:

Q: What is the margin of error for a sample of 34 students whose average height, with 90% confidence,…

A: Confidence Interval: Confidence interval is the interval estimate of the population parameter. It is…

Q: 4) A study of 12,000 cell phone users found that 125 of them developed cancer of the brain or…

A:

Q: If a school district takes a random sample of 89 Math SAT scores and finds that the average is 494,…

A:

Q: If a school district takes a random sample of 71 Math SAT scores and finds that the average is 460,…

A: Given : n = 71 Mean = 460 Standard deviation = 100 Confidence level = 99%

Q: 5, Randomly selected middle-aged people in both China and the United States were asked if they…

A: For China, n =1300 and x = 1170 therefore p^1 =11701300 = 0.9 For USA,  n = 150 and x =110 p^2…

Q: Consider a study conducted in 2018, where researchers wanted to estimate the percentage of middle…

A: Given Information: Margin of error =3% Confidence interval is 95% Consider z value for significance…

Q: Suppose you observe 62 data points from a distribution with standard deviation 2.1, and you…

A: Given, n=62 data points standard deviation SD= 2.1, calculated a 92% two-sided confidence interval…

Q: 13) When 470 junior college students were surveyed, 155 said they have a passport. Construct a 95%…

A:

Q: If a school district takes a random sample of 50 Math SAT scores and finds that the average is 47,…

A:

Q: 9. How can you make a 95% confidence interval smaller without changing the confidence level?

A: There are several number of ways to reduce the size of confidence interval without making any…

Q: Suppose a drug for stomach discomfort is tested on 50 subjects, and the mean time for it to take…

A: To find the confidence interval we will use z distribution because the population standard deviation…

Q: 2. Construct a 90%, 95%, and 99% confidence interval of the mean weight of fresh oranges if 100…

A: Given : Mean , μ = 180 gm Standard deviation, σ = 30 gm sample size, n = 100 a) Confidence Level =…

Q: Suppose that we want a 95% confidence interval for π = proportion of defective if we observe 4…

A:

Q: construct a 95% confidence interval for the true proportion of the population having banking…

A: It ia given that Sample size n = 100 Number of persons having banking relations with either the…

Q: A survey of 100 students showed that 20 % of them planned to major in business. What is a 95 %…

A:

Q: An HR administrator wishes to know the proportion of employees that are currently using a very…

A: It is given that margin of error (E) is 0.14 and the confidence level is 0.80.

Q: Suppose a marketing company randomly surveyed 439 households and found that in 259 of them, the…

A:

Q: Suppose the researcher decided to find 95% confidence interval for the mean working hours based on…

A: The level of significance may be defined as the probability of type I error which we are ready to…

Q: If a school district takes a random sample of 55 Math SAT scores and finds that the average is 422,…

A: It is an important part of statistics . It is widely used .

Q: An educator wants to construct a 99% confidence interval for the proportion of elementary school…

A: The random variable is elementary school children in Michigan who are proficient in reading. It…

Q: what is the margin of error for the confidence interval for the mean  62 81

A: Assume that that µ is the population mean.

Q: If a school district takes a random sample of 61 Math SAT scores and finds that the average is 466,…

A: Find a 99% confidence interval for the mean math SAT score for this district.

Q: 8. Five hundred randomly selected adult residents in Pasig City were surveyed to determine whether…

A:

Q: Suppose 250 randomly selected people are surveyed to determine if they own a tablet. Of the 250…

A:

Q: What is the approximate sample size required to estimate the percentage of Americans who have earned…

A: We want to find the sample size (n)

Q: 2. A sample of 430 business applications included 150 men. Find the 99% confidence interval of the…

A: Answer:-  Given,  X=150 n=430

Q: If a school district takes a random sample of 80 Math SAT scores and finds that the average is 442,…

A: Given that, Sample size n=80 Sample average x¯=442 Population standard deviation σ=100

Q: (b) A sample of 1200 network engineer job applications included 720 are from expatriates. Find  the…

A:

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.