A researcher wishes to estimate the average number of minutes per day a person spends on the Internet. How large a sample size must she select if she wishes to be 99% confident that the population mean is within 13 minutes of the sample mean. Assume the population standard deviation is 41 minutes round your answer to the next whole number

Q: The distribution of the lengths of a commercially caught fish is bell-shaped with mean 24 cm and…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: Refer to the accompanying table, which describes the number of adults in groups of five who reported…

A: The data on the number of adults in a group of five are given as…

Q: Seventy-six percent of Americans favor spending government money to develop alternative sources of…

A: Given that  p = 75%    and.   n = 140 By using the Binomial distribution

Q: A random sample of shoppers at a convenience store are selected to see how much they spent on that…

A: Standard deviation ,σ = 6.94confidence- level = 0.99So, level of significance = 1-0.99 = 0.01E =…

Q: According to Chebyshev's Theorem, within how many standard deviations from the mean would you find…

A: From the provided information, Let within k standard deviations from the mean we find at least 47.5%…

Q: Need asap   For a medical study, a researcher wishes to select people in the middle 75% of the…

A:

Q: In a population of ages where the mean age is 45 and the standard deviation is 5.25, what are the…

A: Given mean age = 45Standard deviation = 5.25The Z score with 0.0505 to its left is -1.64 and the Z…

Q: The annual salaries for workers at a local mill are normally distributed with a mean of $45,000 and…

A: The annual salaries for workers at a local mill are normally distributed with a mean of $45,000 and…

Q: Use Chebyshev's theorem to solve the problem. Find the least possible fraction of numbers in a data…

A: Consider that a random variable X has expected value μ and standard deviation, σ. Now, according to…

Q: knowing the mean will be within ±0.5 mm?

A:

Q: A history class has 95 members. If there is a 22% absentee rate per class meeting , find the mean…

A:

Q: Last year, the revenue for financial services companies had a mean of 7070 million dollars with a…

A: The objective of this question is to find the percentage of companies with revenue between 5050…

Q: The amount of income taxes that people owe each year varies greatly from person to person because…

A:

Q: The average weight of a group of 25 boys was. calculated to be 78'4 lbs. It was later discovered…

A:

Q: You want to know the percentage of financial services companies that earned revenue less than 8181…

A: The objective of this question is to find the percentage of financial services companies that earned…

Q: The statistics below provide a summary of the distribution of heights, in inches, for a simpl random…

A: Firsti quartile (Q1) value interprets that, 25% of the data lie below Q1 value and 75% of the data…

Q: The average and standard deviation for ACT scores are 20 and 3 respectively. average and standard…

A:

Q: Each year students in a local school district write a national examination. The average on this…

A: Average of a dataset is the mean value of the observations in the data and it is computed by…

Q: A nutritionist wants to determine how much time nationally people spend eating and drinking. Suppose…

A: A) option A is the answer. Answer : Since the distribution of time spent eating and drinking each…

Q: Use the five-step procedure to test the research hypothesis that the mean weight in men in the…

A: H0 : ? =191 H1 : ? >191

Q: It is often quoted that in a normal distribution, 95% of the data lies 1.96 deviations either side…

A:

Q: Solve the following problem and show your complete solutions. Explain your answer for better…

A: The length of time that a phone will work before it needs charging is normally distributed with mean…

Q: A person completes a timed task and is told that their z-score for the task is 1.36. The mean for…

A: Given: Population mean (µ) = 10.75 Population standard deviation (σ) = 2.40 z-score = 1.36

Q: It is often quoted that in a normal distribution, 95% of the data lies 1.96 deviations either side…

A: Let X be the random variable   X~ Normal (0, 1)

Q: A Gallup poll wants to determine the mean number of books Americans read each year. How many…

A: The population standard deviation is .The margin of error is The level of Confidence level is .

Q: I am not familiar using the standard deviation formula for my statistics class

A:

Q: Report anything you noticed about the way the graphs were shaped, how they were different as the…

A: Considering the Reese’s Pieces candies manufactured by Hershey are 25 candies: Physical Sample:…

Q: In the 1992 presidential election, Alaska's 40 election districts averaged 2023 votes per district…

A: Givenμ=2023 and σ=555   Use standardization asz=x-μσ

Q: None

A:

Q: A quantitative data set has a size of 50. At least how many observations lie within seven standard…

A: Suppose X is a random variable with expectation, μ and standard deviation, σ. Then, for any positive…

Q: The distribution of the scores on a standardized exam is approximately normal with mean 400 and…

A: The two values of Z that will contain 50% of scores lie are obtained as shown below:From the…

Q: On the SAT, the average Writing score is 490 points and the average Math score is 547 points. The…

A: From the provided information, Average Math score (µ) = 547 points Standard deviation (σ) = 89…

Q: If the range of a data set is 64, find the approximate value of the standard deviation, using the…

A: Given information- Range = 64 We have to find the approximate value of the standard deviation using…

Q: A mechanic sells a l a brand d of automobile tire that has a life expectancy that is normally…

A: The given data is as follows:Population mean, Population standard deviation,

Q: The standard deviation in the sample means is called the margin of error.

A: Answer : False  The given statement is incorrect.

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.