A random sample of six music students played a short song, and the number of mistakes in music each student made was recorded. After they practiced the song 5 times, the number of mistakes each student made was recorded. The data are shown. Student A B C D E F Before 10 6 8 8 13 8 After 4 2 2 7 8 9 d= Before -After 6 4 6 1 5 -1 Construct 99% confidence interval of the difference in means. (  ? , ? )

Q: Of 500 random people surveyed, 72 were smokers.  Find the 95% confidence interval. SE=0.0157

A:

Q: he medical researcher ts comparing two treatments for lowering cholesterol: diet and meds. The…

A: Given information: For this study we should use two-proportion z-test. a)  Null hypothesis: H0:…

Q: A research done by a graduating student reports that the average score of University students in…

A: Solution The researcher wants to test the single mean.

Q: A psychiatrist is interested in finding a 95% confidence interval for the tics per hour exhibited by…

A:

Q: MU CHOICE. Choose the one alternative that best completes the statement or answers the Construct a…

A: Solution: Let x= Before training  and y= After training  x y d=x-y (d-d)2 115.2 116 -0.8…

Q: Professor Fair believes that extra time does not improve grades on exams. He randomly divided a…

A:

Q: Use the confidence interval to find the margin of error and the sample mean. (0.142,0.300) The…

A:

Q: Eric is studying people's typing habits. He surveyed 525 people and asked whether they leave one…

A:

Q: this theory. Round answers to 4 decimal places where possible. a. With 90% confidence the proportion…

A: It is given that Favourable cases, x = 56Sample size, n = 745Confidence level = 90%

Q: A  95% confidence interval for the  proportion of voters who say "they want change" is computed and…

A: From the provided information, Confidence level = 95% Confidence interval for the proportion is…

Q: A dietician is conducting a study to see how many pieces of fruit or vegetables American Adults eat…

A: Given, n = 11 and data set is : 7 5 9 6 10 12 10 1 1 6 5 Calculating Mean and Standard…

Q: A grocery store manager wants to know if displaying cranberries near the entrance to the store…

A: P1 : Proportion of shoppers who buy Cranberries when they are near the store entrance. P2 :…

Q: Data from a two-way table with 6 columns and 6 rows has x² = 40.65. Find the $P$-value for the…

A:

Q: Belief in Haunted Places A random sample of 280 college students were asked if they believed that…

A: Answer below

Q: Having good relationships with coworkers is an important part of overall job satisfaction. A poll…

A: Given, The 95% confidence interval for the population proportion , p is (0.4872,0.5528)

Q: .If you are at the 90th percentile in terms of GPA, then 90% of the sample has a lower GPA than you.…

A: Percentile : Percentile is the number such that certain percentage of data fall below that number.…

Q: In a random sample of Korean Adults, a student records the month the adults were born Jan-Dec and…

A: a. T test is used to determine whether the means are significantly different from 0 when the…

Q: A  95% confidence interval for the  proportion of voters who say "they want change" is computed and…

A: For the population proportion, the confidence interval can be computed using the formulae: C.I=p⏞±E…

Q: find the margin of error of a 99% confidence interval for the mean score of all student

A: It is given that  Sample mean = 93 Sample standard deviation, s = 7 Sample size, n = 30

Q: main, the

A:

Q: syndrome. The data below show the tics in an observed hour for 15 randomly selected children with…

A: Given data : 0, 0, 2, 3, 5, 6, 7, 7, 8, 8, 8, 9, 9, 9, 10

Q: The director of a hospital wishes to estimate the mean number of people who are admitted to the…

A: From the given information, Sample size n =49 Sample mean, x̅=17.3 Sample variance s2 =25 Sample…

Q: Beth wants to determine a 90% confidence interval for the proportion of high school students in a…

A: We have given that,  Population proportion (p) = 0.57, margin of error (E) = 0.04 and confidence…

Q: The figure shows the results of a recent Marist poll asking about President Biden’s approval rating.…

A: *Answer:  Given the results of a recent Marist poll asking about President Biden’s approval rating.

Q: m what their favorite color was. 23 people said their favorite color is blue. Using this sample,…

A: Sample proportion is the fraction of successful samples and total number of samples. Here,  Total…

Q: Calcium is essential to tree growth because it promotes the formation of wood and maintains cell…

A: From the provided information, a) The hypotheses are as follow: H0: µ = 0.12 mg/L H1: µ ≠ 0.12 mg/L

Q: A psychiatrist is interested in finding a 98% confidence interval for the tics per hour exhibited by…

A: 1. For the given data, x¯=7.5455, from the excel function, =AVERAGE(E20:E30)s=4.6122, from the excel…

Q: In one city, 59.6% of the 1500 students surveyed said they eat at the school cafeteria. Find the 95%…

A: Given, Sample size=n=1500 p^=0.596 α=0.05

Q: A confidence interval for (u, -µ2) is (-8, 2). Which o

A: The confidence interval for μ1-μ2 is (-8,2)

Q: Hearts College found that 50 students out of a sample of 600 students take the subway to school.…

A: Given data is fit for difference of proportions. we need to find the confidence interval for 90%.

Q: You are interested in finding a 90% confidence interval for the average commute that non-residential…

A:

Q: one with a 95% confidence level and the other with a 99.7% confidence level. Which interval is…

A: Confidence interval is probability, which refers that population parameter will fall within set of…

Q: Random samples of female and male UVA undergraduates are asked to estimate the number of alcoholic…

A: We have to create 96.2% confidence interval for the difference in means for males and females.

Q: Thirty randomly selected students took the calculus final. If the sample mean was 74.2 and the…

A: From the provided information, Sample size (n) = 30 Sample mean (x̅) = 74.2 Standard deviation (s) =…

Q: Use the confidence interval to find the estimated margin of error. Then find the sample mean. A…

A: Given, A biologist reports a confidence interval (1.7,2.9 ) of when estimating the mean height​ (in…

Q: You are constructing a 99% confidence interval for the proportion of all caterpillars that…

A: Given information- Sample size, n = 396 We have given that out of 396 randomly selected caterpillars…

Q: A random sample of n1 = 262 people who live in a city were selected and 117 identified as a "dog…

A: Reviewing information, n1=262 x1 : No. of identified dog person in a city=117 n2=108 x2 : No. of…

Q: Hypertension It has been found that 26% of men 20 years and older suffer from hypertension (high…

A: Given,   no of men who have high B.P =40 no of women who have high B.P=53 n1=145 n2=145 p1=26%=0.26…

Q: Thirty randomly selected students took the calculus final. If the sample mean was 95 and the…

A: From the provided information,

Q: Please answer number 13.

A: It is given that 43% had no children, 18% are had one child, 18% are have two children, 21% have…

Q: Assume that the average home price in the U.S. is µ = $292,700 with o = $60,000. A local real estate…

A: Hypothesis: The null and alternative hypotheses are below: H0: μ=292,700H1: μ>292,700 The test…

Q: If n = 15, the sample mean = 150, SD = 10, what is the confidence interval (using 99% confidence…

A: Given data,n=15x=150σ=10z-value at 99% confidence is Zc=2.576

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.