The proportion of Americans who have frequent migraines is 15.2% according to the CDC. An acupuncturist claims that her treatment can reduce this figure significantly. A random sample of 594 Americans is administered the acupuncturists treatment and 71 report experiencing migraines.   What is the sample proportion? (Round to 2 decimal places) ˆpp^=______

Q: At a large industrial plant, employees were classified according to age and given a leadership exam.…

A: Hypothesis testing is an inferential procedure of testing a claim about a population characteristic.

Q: ents entering a university who finished in 4 years or less was 62%. To test whether this proportion…

A: Following information can be extracted as:   Hypothesized proportion = 0.62 Sample proportion = 0.45…

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

A: Given x=986 n=2253

Q: The mean lifetime income of high school graduates in the United States is 2 million dollars higher…

A: @solution:::   Given data : typical high school student 7.5 hours 180 days  for 4 years  For…

Q: A consumer product magazine recently ran a story concerning the increasing prices of digital…

A: From the provided information, The average price of all digital cameras a couple of years ago was…

Q: What would an outlier look like on box plot

A: Box plot diagram or Whisker’s plot is a graphical method of depicting the data by quartiles and…

Q: What is the percentage of scores that lie between a z score of -2 and a z score of 1?

A:

Q: Ten years ago 53% of American families owned stocks or stock funds. Sample data collected by the…

A: Given data Population proportion Po = 0.53 Sample proportion P= 0.46 Sample size n = 500 We have…

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

A:

Q: On the first two weeks of the fourth quarter, you learned to find the deciles of grouped and…

A: The values which divide a frequency distribution of a variable into ten equal parts, are said to be…

Q: A researcher is studying changes in the student body at her university and has selected a random…

A: (a) (b) (c)

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: An article in the Archives of Internal Medicine reported that in a sample of 244 men, 73had elevated…

A:

Q: study was con tion-based sample of er cirrhosis during the

A: Here we have to calculate a suitable measure for above prospective cohort study  relative risk is…

Q: Suppose that historically, the proportion of people who trade in their old car to a car dealer when…

A: Givensample size(n)=115No.of old cars(x)=46p^=xn=46115=0.40

Q: A consumer product magazine recently ran a story concerning the increasing prices of digital…

A: The degrees of freedom is, df=n-1=22-1=21 The degrees of freedom is 21. The significance level is…

Q: Recently, 18.3% of visitors to the Travelocity website hailed from the Google search engine. A…

A: It is given that Sample size n = 130 Population proportion p = 18.3% = 0.183

Q: 4. What is the percentage of the patients who recovered in or after 10 days?

A:

Q: Historically, the proportion of people who trade in their old car to a car dealer when purchasing a…

A: Given  p0=48% , n=115 , X=46 Level of significance=10%=0.10

Q: Consider taking a point estimate from a randomly selected population of 120 students with a number…

A: The population is defined as a whole set of observations. It is difficult to deal with,…

Q: The Bata Shoe Museum states that 4343% of women wear shoes that are too small for their feet. A…

A: Given,sample proportion(p^)=0.43margin of error(E)=0.015α=1-0.98=0.02α2=0.01Z0.01=2.3263       (from…

Q: A random sample of 60 students in the business statistics course answered a survey on the average…

A: From the given data: Mid-point=Upper clas limit +Lower class limit2 Classes Mid-point (x)…

Q: A police officer waits on a road to catch speeding cars. In a one hour sample, the officer find that…

A:

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: A population with µ = 58  and σ = 12 is transformed into z-scores.  After the transformation, what…

A: It is given that a population with mean is 58 and the standard deviation 12.

Q: A random sample of 4000 U.S.citizens yielded 2280 who are in favor of gun control legislation. Find…

A: Given:A rondom sample of 4000 U.S citizensyielded 2280 who are in favor of guncontrol…

Q: In a random sample of 500 males and 600 females who did statistics, 128 males and 434…

A: Given information Subscript 1 denotes male and subscript 2 denotes female

Q: An examinee of the National Medical Admission Test (NMAT) got a percentile rank of 95%. What does…

A: Given that an examinee of National Medical Admission Test (NMAT) got a percentile rank of 95% .

Q: What does a z score of -4 mean?

A: z-score: The z-score is a standardized score which represents the number of standard deviation that…

Q: In a study about children's pocket money, two samples of schoolchildren were asked how much money…

A: Combined mean=n1x1+n2x2n1+n2 Given that, n1=first sample size of childrens pocket money=87 x1=first…

Q: What is the formula for converting z score to original score?

A: Solution: Let X be the random variable. Suppose X has a mean µ and standard deviation σ. Then, the z…

Q: This means the test statistic will equal approximately what value

A: It is given that Sample size n = 750 Number of users under the age of 18, X = 51

Q: How do calculate a z-score

A: In general z-score is the standard normal score.

Q: The marketing research company comScore, Inc. reported that 65% of online searches in March 2010…

A: The proportion of sample and the population significance difference is tested using the z test.…

Q: How do you compute median in Excel?

A: Enter the given data in first column of excel sheet.

Q: The drug manufacturer claim that taking gemfibrozil is beneficial to reduce the chance of heart…

A:

Q: The mean age of a group of 100 persons was found to be 32.02. Later, it was discovered that age 57…

A: given solution: incorrect sum of ages = 32.02*100 = 3202 27 + sum of ages of rest 99 students= 3202…

Q: An article included data from a survey of 2587 hiring managers and human resource professionals.The…

A: From the provided information, Margin of error (E) = 0.03 Confidence level = 99%

Q: 23% of the students graduating from a local high school received scholarships to college. If 163…

A: We have to find the value students total graduated from the local high school

Q: What is the relative frequency of deaths that occurred in 2000 or before?

A: Here Given the number of deaths between year 1994-2011 And total no of deaths=653782

Q: f cases fall more than 1.5 standard deviations away from the mean?

A: Given that  1.5 standard deviations away from the mean    We know that  Z score is the value that…

Q: If the variance of a national accounting examination is 900, how large a sample is needed to…

A:

Q: How to determine Estimate the P-value.

A: Introduction:P-value: The P-value is the probability of obtaining a test statistic value as extreme…

Q: Historically, the proportion of students entering a university who finished in 4 years or less was…

A: H0 : p =0.63 H1 : p <0.63 Population proportion = p₀ = 0.63

Q: . NCAE shows that the average score of the students is 80 and sd is 15.  What is

A: From the given information, μ=80σ=15

Q: If the variance of a national accounting examination is 900, how large a sample is needed to…

A:

Q: Suppose you are told your BMI is 32, the  70th percentile for your age and sex. Please interpret…

A: Introduction: The pth percentile of a set of observations is the value below which, p% of the…

Q: You are conducting a study to see if the proportion of voters who prefer the Democratic candidate is…

A: Given: n = 89, x = 52, α = 0.05, p = 0.59. Sample proportion: p^=xn=5289=0.5843

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.