Internet Viewing 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 95% confident that the population mean is within 9 minutes of the sample mean? Assume the population standard deviation is 47 minutes. Round your final answer up to the next whole number. The researcher needs a sample of at least people.

Q: In the diagram, about 68% of the scores fall within the shaded area, which is symmetric about the…

A: For 68%; Range can be given as Mean +/- SD

Q: Observe the values of the means and standard deviations in the four samples you gathered and list as…

A: Simple random sampling is the technique of selecting the in such a way that way each sample has an…

Q: In a memory test, the test subjects are shown 625 objects and are asked after two hours to name the…

A: Given,          sample size n=625           sample proportion P∧=80%=0.80       A)    Mean=P∧…

Q: . About what percent of x values lie between the first and third standard deviations (both sides)?…

A:

Q: Internet Viewing A researcher wishes to estimate the average number of minutes per day a person…

A:

Q: On Sundays 35% of the TV’s watch a program. Find the mean and standard deviation for the number of…

A: Given : probability of success, p=0.35 sample size,n=2000

Q: Internet Viewing A researcher wishes to estimate the average number of minutes per day a person…

A: Using Excel formula “=NORM.S.INV(1-(0.10/2))”, the critical value is obtained as 1.645.

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

A:

Q: Going to work: A news report stated that the mean distance that commuters in the United States…

A: Given data,Mean μ=14sd     σ=9n=80P(15<X<16)=?

Q: A Population has a Mean of 90 and a standard deviation of 25.  A sample of 20 college students is…

A:

Q: Facebook Friends Many people believe that the average number of Facebook friends is 140. The…

A: Consider that μ is the population number of Facebook friends.

Q: 5.tac uses the facebook app everyday. He used the app for 9 hours last Monday with the equivalent…

A: Probability distribution

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: Teachers’ Salaries A researcher is interested in estimating the average salary of teachers in a…

A:

Q: Watch help video When Ian commutes to work, the amount of time it takes him to arrive is normally…

A: Given: Population Mean (\mu)(μ) = 5959 Population Standard Deviation (\sigma)(σ) = 33

Q: ewing A researcher wishes to estimate the average number of minutes per day a person spends on the…

A: Given: Confidence level = 0.99     Population standard deviation σ=38 Margin of error (E) =    10

Q: Tony V. owns a house painting business in Seattle. He estimates that it takes his crew three-…

A: Given that, Sample size n=25 Sample mean x¯=3.185 Sample standard deviation s=0.6514

Q: king More time on the Internet: The General Social Survey polled a sample of 1048 adults in the year…

A: Given Data : For Sample 1 x̄1 = 9.79 s1 = 13.41 n1 = 1048 For Sample 2…

Q: The rainfall in a town last year measured 61 inches. If the annual rainfall has a mean of 47.34…

A: given : mean ( u ) = 47.34 inches standard deviation ( σ ) = 12.75 inches measured rainfall ( x ) =…

Q: Internet Viewing A researcher wishes to estimate the average number of minutes per day a person…

A: Level of significance: In the testing of a hypothesis, the level of significance is the probability…

Q: The intelligence quotient, or 1Q, is a measure someone ability to reason and solve problems (some…

A:

Q: Emily's chicken ranch has 9 hens.  The number of eggs that each has laid in the past week follows:…

A: Measure of central tendency measures the central or average value of a dataset. Measured of…

Q: Lara wants to know if the number of words on a page in her English book is generally more than the…

A: Given information: The values of mean for the English and history books are 48.9 and 40.5,…

Q: The rainfall in a town last year measured 19 inches. If the annual rainfall has a mean of 46.06…

A:

Q: Approximately 6% of American drivers d not text while they drive. Suppose you are working with a…

A: The given situation fits binomial distribution as there are 300 independent trials (300 people),…

Q: The average life of a car tire is 50,000 miles.  The standard deviation is 2,000 miles   What…

A: Normal distribution, also known as the Gaussian distribution, is a probability distribution that is…

Q: A statistics professor surveys all 100 of the students in an introductory statistics lecture. The…

A: In this context, it that the professor conducts the survey on all 100 students in an introductory…

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A: Population standard deviation, sigma is 71.7. The z-critical value for 98% confidence interval is…

Q: You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

A:

Q: The proportion of adult women in a certain geographical region is approximately 51%. A marketing…

A: Find the proportion of sample of 200 that are expected to be women:Here, it is given that,…

Q: A population has a Mean of 100 and a standard deviation of 15.  A sample of 20 college students is…

A: Given information- Population mean, µ = 100 Sample mean, x-bar = 125 Population standard deviation,…

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A:

Q: Cherise is interested in how her friends compare to the population for number of hours of television…

A: The test statistic is,

Q: Internet Viewing A researcher wishes to estimate the average number of minutes per day a person…

A:

Q: The data below represents the total number of points each hockey team in the NHL Eastern conference…

A: Given data is {52,66,84,88,93,100,101,117}find the standard deviation

Q: The northern lights (or Aurora Borealis) appear on some nights during the winter in Alaska. The…

A:

Q: A student studying statistics wants to look at data for his favorite sport, American football. He…

A: It is given that that a student collect data on the lengths of 100 field goals from various games…

Q: Internet Viewing A researcher wishes to estimate the average number of minutes per day a person…

A:

Q: ow many TV sets? A survey organization sampled 63 households in a community and found that the…

A:

Q: Professors A friend tells you about a recent study deal-ing with the number of years of teaching…

A:

Q: Babies: According to a recent report, a sample of 300 one-year-old baby boys in the United States…

A: Explanation:in this  the answer is should  In step2 the clearly writed

Q: Answer according to Swikness theorm. Thank you Illustration : The mean and standard deviation of a…

A:

Q: Thirty-one percent of adults think that life existed on Mars at some point in time.   You randomly…

A: Given information: Thirty-one percent of adults think that life existed on Mars at some point in…

Q: Individuals who have a certain gene have a 0.49 probability of contracting a certain disease.…

A: 1Q) Given data, p=0.49 n=792 Standard deviation=?

Q: On a standardized test with 85 and the standard deviation is 3. Within which range should…

A: Given mean, μ = 85 standard deviation, σ = 3

Q: Internet Viewing A researcher wishes to estimate the average number of minutes per day a person…

A: Obtain the sample size.   The sample size is obtained below as follows:   The formula of sample…

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A:

Q: The average number of milligrams (mg)of cholesterol in a cup of certain brand of rice is 660 mg,the…

A: Given : Sample mean (µ)=660 Standard deviation (σ)=35 Sample size (n)=10

Q: z Scores LeBron James, one of the most successful basketball players of all time, has a height of 6…

A: According to the provided information,

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

A: Given data,   Mean=? Standard deviation =?

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.