A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 4 percentage points with 99% confidence if (a) he uses a previous estimate of 26%? (b) he does not use any prior estimates? Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2).

Q: Is the difference between the mean annual salaries of statisticians in Region 1 and Region 2 more…

A: Solution: Given information: n1=48  Sample size of region 1n2= 44 Sample size of region 2x1=$67700…

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A:

Q: The shape of the distribution of the time required to get an oil change at a 20-minute oil-change…

A: We have given that.    X~N( μ , ?^2 )    μ =21.8      , ? = 4.2   Z-score =( x - μ )/?

Q: In a poll, 69% of the people polled answered yes to the question "Are you in favor of the death…

A: Solution

Q: The shape of the distribution of the time required to get an oil change at a 15-minute oil-change…

A: Given  μ=16.6, σ=4.4

Q: The shape of the distribution of the time required to get an oil change at a 20-minute oil-change…

A: Given information- Population mean, µ = 21.8 minutes Population standard deviation, σ = 4.2 minutes…

Q: For a normal population with a mean equal to 90 and a standard deviation equal to 14, determine the…

A: Given dataμ=90σ=14x¯=98 Also given n=7

Q: If you want to be 95% confident of estimating the population mean to within a sampling error of ±20…

A: Given problem Given that   If you want to be 95% confident of estimating the population mean to…

Q: A television sports commentator wants to estimate the proportion of citizens who "follow…

A: Given Information: Margin of error, E = 2% =0.02 Confidence Level, C = 94% =0.94

Q: A random sample of 1009 adults in a certain large country was asked "Do you pretty much think…

A: Given,  X = 534 n = 1009       To find, a) Point estimate for the opulation proportion ? b. Verify…

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A:

Q: A professor gives a test worth 100 points. The mean is 95, and the standard deviation is 4. Is it…

A: Given data  Mean = 95 STD dev = 4  X = 100

Q: A television sports commentator wants to estimate the proportion of citizens who "follow…

A:

Q: Assume that the mathematics scores on the SAT are normally distributed with a mean of 500 and a…

A: Let X be the mathematics score in SAT exam. Therefore: X~Norm(μ=500, σ=100)

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A:

Q: Assume that the speed of automobiles on an expressway during rush hour is normally distributed with…

A: It is known that a normal distribution is symmetrical about the mean

Q: Click here to view page 2 of the standard normal distribution table. student(s) (Round to the…

A: It is given that  Mean, μ = 117 Standard deviation, σ = 14 Sample size, n = 550 Z-Score, Z = ( X - μ…

Q: Assume the annual day care cost per child is normally distributed with a mean of $7000 and a…

A: Assuming the annual daycare cost per child is normally distributed with a mean of $7000 and a…

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: Given,margin of error(E)=0.05α=1-0.99=0.01α2=0.005Z0.005=2.58    (from Z-table)

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: We have given that Margin of error =E = 4 Population proportion p=28%=0 .28

Q: A professor gives a test worth 100 points. The mean is 94, and the standard deviation is 6. Is it…

A:

Q: A television sports commentator wants to estimate the proportion of citizens who "follow…

A: From the provided information, Confidence level = 95% Margin of error = 4% that is 0.04

Q: Assume the annual day care cost per child is normally distributed with a mean of $7000 and a…

A:

Q: In a Scrabble tournament, the scores were normally distributed and the mean score was 420.2 points…

A:

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: Given,margin of error(E)=0.03sample proportion(p^)=0.26α=1-0.95=0.05α2=0.025Z0.025=1.96    (from…

Q: A survey is planned to determine the mean annual family medical expenses of employees of a large…

A: Given,population standard deviation(σ)=319margin of error (E)=60α=1-0.90=0.1α2=0.05Z0.05=1.645…

Q: In a Scrabble tournament, the scores were normally distributed and the mean score was 420.2 points…

A:

Q: A television sports commentator wants to estimate the proportion of citizens who "follow…

A: It is given that margin of error (E) is 0.02 and the confidence level is 0.96.

Q: Suppose a geyser has a mean time between eruptions of 60 minutes. If the interval of time between…

A: From the given information, μ=60σ=14 c) n=26

Q: The shape of the distribution of the time required to get an oil change at a 10-minute oil-change…

A:

Q: A study is to be made to estimate the proportion of residents of a certain city and its suburbs who…

A: From the provided information, Margin of error (E) = 0.06 Confidence level = 90%

Q: A random sample of 1009 adults in a certain large country was asked "Do you pretty much think…

A: we know that if n number of sample surveyed and X individuals have respond in favour of success.…

Q: Given a data set that can be graphed as a standard normal curve, respond to the prompts below. What…

A: Note: Since you have posted a question with multiple subparts, we will solve the first three…

Q: According to a study, the proportion of people who are satisfied with the way things are going in…

A: given that n=100,p=0.80

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A:

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: Margin of Error = E = 0.04 Confidence Level = 95 Significance Level = α = (100-95)% = 0.05 α/2…

Q: Is the difference between the mean annual salaries of statisticians in Region 1 and Region 2 more…

A: Given information- We have given two samples- For sample 1- Sample size, n1 = 48 Sample mean, x1-bar…

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: a) From the given information, Margin error (E) = 0.04 Sample proportion = 0.38   The objective is…

Q: A random sample of 1009 adults in a certain large country was asked "Do you pretty much think…

A:

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: Margin of Error = E = 0.04 Confidence Level = 95 Significance Level = α = (100-95)% = 0.05 α/2…

Q: A survey is planned to determine the mean annual family medical expenses of employees of a large…

A:

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: Given thatMargin of error (E) = 5% = 0.05Significance level (α) = 1 - 0.90 = 0.10

Q: Assume the annual day care cost per child is normally distributed with a mean of $6000 and a…

A: Solution: Let X be the annual care cost per child. From the given information, X is normally…

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. sample…

A: a) Given : Margin of error: ME = 0.05 sample proportion: p̂ = 0.28…

Q: The shape of the distribution of the time required to get an oil change at a 20-minute oil-change…

A: a) The mean nis 21.8 and the standard deviation is 4.2.

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A:

Q: Suppose we have the short hand info on a Normal Distribution as N(10,25). What is the population…

A: Mean:Mean is a measure of center in case of quantitative data. Mean of a data set is the sum of the…

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: Provided information is, a researcher wishes to estimate the percentage of adults who support…

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: a) The population proportion is 24%=0.24. The confidence level is 90%. Margin of error is 0.04(4%).…

Q: The shape of the distribution of the time required to get an oil change at a 15-minute oil-change…

A:

Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.