A random sample of 300 students was taken from an affluent school district. There were 75 students who were coached for the SAT's. Within what interval will the population proportion fall 99% of the time?(show work)

Q: A random sample by the National Institutes of Health included 2253 men to determine the proportion…

A: Given x=986 n=2253

Q: A random sample of 2000 driver's license applications found that 17% reported their eye color as…

A:

Q: A software company is interested in improving customer satisfaction rate from the 60% currently…

A:

Q: an you conclude that the percentage of people aged 18-29 who have a tattoo is less than 25%

A: Given : n=830 , X=166 , p0=0.25 , α=0.01 The estimate of the sample proportion is ,…

Q: A survey of 2390 musicians showed that 398 of them are left-handed. Find a point estimate for p, the…

A: We have find population left handed..

Q: IQ is normally distributed with a mean of 100. Which are there more of: people with an IQ less than…

A: Normal distribution is a continuous distribution which has many real life applications. Normal curve…

Q: The beta shoe museum states that 68% of women wear shoes that are too small for their feet. A…

A: Given : Margin of error: ME = 0.02 sample proportion: p̂ = 0.68…

Q: Can you statistically put that something is within the 100th percentile? For examlpe a z-score of…

A: 100th percentile means that you have the highest test score possible. 100th percentile means you've…

Q: Assume that IQ scores are normally distributed with μ = 100 and σ = 15 What percent of IQ scores…

A: The normal distribution is the most useful theoretical distribution for continuous variables.  For…

Q: The recidivism rate for convicted sex offenders is 14%. A warden suspects that this percent is…

A:

Q: The recidivism rate for convicted sex offenders is 15%. A warden suspects that this percent is…

A:

Q: The Bata Shoe Museum states that 16% of women wear shoes that are too small for their feet. A…

A: 16% women wear shoes that are too small for their foot. So, proportion of women wear shoes that are…

Q: The table below shows the number of i employees within a small construction company classified…

A:

Q: The state education commission wants to estimate the fraction of tenth grade students that have…

A: The proportion of tenth graders reading at or below the eighth grade level is calculated below:

Q: A survey conducted between January 1, 2001 and December 31, 2001 identified 3,240 cases of Type I…

A: Given:        Size of population = N = 4500,000        number of cases in 2001 =3240…

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

A: Solution: From the given information, confidence level is 0.96, p=0.54 and E=0.02.

Q: A random sample of 260 workers in a high rise office building revealed that 30% were very satisfied…

A: Let the proportion of workers who are satisfied with the quality of work be p^ p^ = 0.30 (point…

Q: What is the​ p-value?

A: Here sample size is too large so use z test for proportion

Q: A manufacturing company claims that the average lifetime of their incandescent lamps is 1300 hours.…

A: We have given that data. From data i want to calculated. Mean = sum of all observations/total number…

Q: The IRS is interested in estimating the total number of tax accounts who has their own tax returns…

A: A random sample of 100 returns showed that 15 were audited; n=100 x=15 α=0.95

Q: In order to estimate attendance at a music festival, management counts the number of people entering…

A: it is follow A,P with first term a = 2250, d = 2250 , n = 20

Q: The sales force at a certain company successfully closed 92 out of 200 sales calls. What was their…

A:

Q: Addmissions officer sampled 124 entering freshmen and found that 35 of them scored less than 530 on…

A: According to the provided information, x=35 n=124

Q: A very wise teacher measured brain activity in all 20 seniors in his Statistics class in the first…

A: We have to find p value for given testing.

Q: At the local college, a study found that students earned an average of 9.2 credit hours per…

A: From the given information, The average number of credit hours per semester is, x=9.2 The random…

Q: You took the English achievement test to obtain college credit in freshman English by examination.…

A: General definition of pth percentile: For whole numbers p(where 1<p<99) , the pth percentile…

Q: The recidivism rate for convicted sex offenders is 8%. A warden suspects that this percent is…

A: Given Information: Hypothesized value of population proportion p0=0.08 Sample size n=321 Out of…

Q: What is the point estimate of the true proportion of people in the population who are over 6 feet…

A: Given that, Sample of 50 peoples is to be drawn and out of which 14 are possessing  characteristic…

Q: Since 2005, the American Community Survey polls ∼3.5 million households yearly. The following…

A: The population is the whole set of data that are used for study and its unknown value of the…

Q: Out of 147 faculty members at Bellevue University, 13 said they can speak Spanish. Construct and…

A:

Q: A historian examining British colonial records for the Gold Coast in Africa suspects that the death…

A: The proportion of African that died is p1=x1n1=24534002=0.007205459 The proportion of Europeans that…

Q: Round the point estimate to the nearest thousandth. 445 randomly selected light bulbs were tested…

A: Given, No of light bulbs tested n = 445 No of light bulbs last more than 500 hours x = 316

Q: A teacher measured brain activity in all 60 seniors in her Statistics class in the first week of…

A: The null and alternate hypothesis are H0 : μd=0HA : μd<0 where, μd is the difference of the first…

Q: A pharmaceutical researcher wants to determine the proportion of people who believes that branded…

A: Given that  Margin of error =E =1%=0.01 95% confidence.

Q: Sixteen out of 35 high school seniors ran the mile in less than 6.25 minutes. At a=0.01, is there…

A: Solution: Give Total =60 X+ =35 remaing. X-=25 The test statistic is X = \min\{X^+, X^-\} =…

Q: Using a random sample of 4000 TV households, a media research company found that 65.8% watched the…

A:

Q: The percent of the population that is left-handed has historically been 10%. In a random sample of…

A: Solution: State the hypotheses Null hypothesis: That is, the per cent of the population that is…

Q: private opinion poll is conducted for a politician to determine what proportion of the population…

A:

Q: 5. The average cost of mini protein bars is between $30 and $60. What is the range of the number of…

A:

Q: The recidivism rate for convicted sex offenders is 11%. A warden suspects that this percent is…

A:

Q: Define three measures one can take to increase the power of an experiment. Explain why your measures…

A: Power: The power of the test is the probability of correctly rejecting the null, H0, when the…

Q: The manager of a city recreation center wants to estimate the percent of city residents who favor a…

A: The confidence interval for the population proportion (single sample) is obtained by using the…

Q: A study at Harvard found that 44% of their students binge drink.  You are at Princeton doing a…

A: According to the provided information, a study at Harvard found that 44% of their students binge…

Q: A historian examining British colonial records for the Gold Coast in Africa suspects that the death…

A: The number of samples extracted from the population is the sample size. When the sample size 30 or…

Q: The sales force at a certain company successfully closed 94 out of 200 sales calls. What was their…

A:

Q: Five years ago 54% of American families owned stocks or stock funds.the Investment Company Institute…

A:

Q: A study found that 13% of Americans have seen or sensed the presence of an angel. A contingent…

A:

Q: Before an increase in excise duty on tea, 400 people out of a sample of 500 persons were found to be…

A:

Q: Fifty people are selected randomly from a certain population and it is found that 12 people in the…

A: Sample size = n = 50 Sample number of events = x = 12 Sample proportion = p̂ = x/n = (12/50) =…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.