A researcher wishes to estimate the average number of minutes per day a person spends on the Internet. How large a sample must she select if she wishes to be 90% confident that the population mean is within 12 minutes of the sample mean? Assume the population standard deviation is 40 minutes round your answer to the next whole number.

Q: Suppose the mean percentage in Algebra 2B is 70% and the standard deviation is 8%. What percentage…

A: GivenMean(μ)=70%standard deviation(σ)=8%

Q: You throw a ball as far as you can 5 times, recording the distance for each throw: 165 feet, 184…

A: since only 5 observation is given we will consider them as sample (n = 5)and population (N = 100)…

Q: some reports, the mean and coefficient of variation are given. For instance, one report gives the…

A: Given that the mean is 2.6 and the coefficient of variation is 2.7%. We have to find the standard…

Q: If the you were given a set of measurements 9.5 g, 8.5 g,9,1 g, 9.3 g, and 9.1 g, What is the mean…

A:

Q: A researcher measures the amount of food consumed by each dog in her lab. She finds that the mean…

A: It is given that mean amount of food is 12 oz and number of dogs is 16. The sum of squared…

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: 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: People with z-scores about 2.5 on an IQ test are sometimes classified as geniuses. If IQ scores have…

A: The z-score denotes how many standard deviations away from the mean a raw score is The z-score can…

Q: If your calculator finds both kinds of standard deviation, the sample standard deviation and the…

A: Solution-: If your calculator finds both kinds of standard deviation, the sample standard deviation…

Q: The following are data regarding number of minutes to accomplish a certain task: 121, 134, 145, 212,…

A: From the provided information, The data values are as follow: 121, 134, 145, 212, 289, 306, 367,…

Q: We have provided simple data sets for you to practice the basics of finding a a. population mean. b.…

A: Solution: a. Let X be the random variable. The given data is 1, 2, 4, and 4

Q: Your friend is planning to apply to law school. He is reading what a typical law student's life is…

A: Standard deviation is measure of uncertainty.If a data has large sd it dispersed in wide area.Large…

Q: We have provided simple data sets for you to practice the basics of finding a a. population mean. b.…

A: The given data is 2, 5, 0 and –1.

Q: 3. An instructor is administering a final examination. She tells her class that she will give an A…

A:

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

A:

Q: Suppose the mean percentage in Algebra 2B is 70% and the standard deviation is 8%. What percentage…

A:

Q: 95% of 80 night students scored between 70% and 80% on a quiz. If this data is normally distributed,…

A: Given: Total number of students n=80.             let X  denote the marks of students then,  X ~N(µ,…

Q: A medical lab tested a sample of 8 vials of blood for acidity on the pH scale.  Use this data to…

A:

Q: A candy manufacturer has replaced 5.17% of their chocolate bars with a new mystery flavor. Find the…

A: Given: Sample size (n) = 424 p(chocolate bars with a new mystery flavor) = 5.17% = 0.0517

Q: On a nationwide math test, the mean was 72 and the standard deviation was 7. If Roberto scored 90,…

A: Given that, Mean = 72 Standard deviation = 7

Q: Tony decided that he wants to pursue a master degree in business. One of the requirement is the GMAT…

A: Given that  Tony's GMAT = X = 730 Mean = 556 , Standard deviation = 116

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: The distribution of IQ (Intelligence Quotient) is approximately normal in shape with a mean of 100…

A: The random variable IQ follows normal distribution. We have to find the probability of people who…

Q: With the extra data value,  the range, standard deviation, and variance is?

A: Given data: 3.31 2.79 2.83 1.97 1.69 2.54 2.46 3.44 3.93 1.59 2.86 1.61 2.57 4.02 2.49 2.42…

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

A: Answer : False  The given statement is incorrect.

Q: The per capita consumption of chicken rose from 36.9 pounds in 1965 to 90.1 pounds in 2015 according…

A: A) Mean is average of all data points. x = 110+93+......+86/152 = 86 Standard deviation  =…

Q: We have provided simple data sets for you to practice the basics of finding a a. population mean. b.…

A:

Q: A quantitative data set as a mean of 24 and a standard deviation of 2. What percent of the…

A: Given,Mean, = 24Standard deviation, S = 2Using formula (Chebyshev's theorem),Chebyshev's theorem…

Q: We have provided simple data sets for you to practice the basics of finding a a. population mean. b.…

A:

Q: You want to know the percentage of utility companies that earned revenue greater than 94 million…

A: Given Mean(μ)=60standard deviation(σ)=15

Q: An engineer wishes to determine the width of a particular Electronic Component. If she knows that…

A: Given,Standard deviation σ = 3.8confidence level is 90%Margin of Error E = 0.2

Q: 5. The quality control manager at a light bulb factory needs to estimate the mean life of a large…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: Someone tells you that the mean score on a test was 85, and the standard deviation was -10. What…

A: GivenMean(μ)=85standard deviation(σ)=-10

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.