Katy Perry is currently the most popular account on Twitter® with about 100 million followers. Mrs. Zane wondered what proportion of Katy Perry’s Twitter followers are female, so she selected a random sample of 500 of Katy Perry’s followers. In the sample, 308 are female. Construct a 90% confidence interval for the proportion of all of Katy Perry’s Twitter followers who are female. Follow the four-step process and upload a scan/picture of your work.

Q: A business school dean in Ohio wants to know if graduates who completed an internship during their…

A: Sample size = n = 1500 Sample mean = m = 50,970 Sample SD = s = 12,976  The average alumni who…

Q: The mean score on a set of 25 tests is 76. What is the sum of all the test​ scores?

A: The mean (aka the arithmetic mean, different from the geometric mean) of a dataset is the sum of all…

Q: A psychologist wanted to know if students in her class were more likely to cheat if they were low…

A: Given dataA psychologist wanted to know if students in her class were more likely to cheat if they…

Q: Kari wants to do an experiment to see if class level (freshman, sophomore, etc.) affects total…

A: An experiment can be repeated multiple times and it has well-defined possible outcomes.

Q: expected number of students who read the book online.

A: Students purchased hard copy =P(H) = 60% =0.60 Students print out from the web =P(W)= 25% = 0.25…

Q: Use critical thinking to list at least three things wrong with this survey. Explain fully using…

A: Given information: The results of online survey are given.

Q: A national polling organization surveyed 1000 Americans and found that 350 admitted to being guilty…

A: Given: x=350 n=1000 p^=xn=3501000=0.35

Q: In each game of the season a basketball player scored the following:…

A: Solution:Mean ˉx=∑x/n  =(8+19+15+7+8+12+19+16+20+13+10+11)/12  =158/12  =13.1667 Median…

Q: Emily and Hillary began arguing about who did better on their tests, but they couldn't decide who…

A: Note: Hi there! Thank you for posting the question. To avoid the Plagiarism issue we have used the…

Q: A policeman believes that less than 40% of older drivers speed on highways, but a confidential…

A:

Q: A psychologist wanted to know if students in her class were more likely to cheat if they were low…

A: A descriptive statistic is a summary statistic that quantitatively describes or summarizes features…

Q: Please answer the question on the photo.

A: Here, random sample of students of schedule of bedtime.

Q: There were 5 members of a basketball team, who had a mean score of 12 points each per game. One of…

A: Given n=5, Xbar=12, n=4, Xbarreduced=10

Q: standardized algebra test in different states. Kaitlyn takes the test for Virginia and scores a 458.…

A:

Q: The Congressional Budget Office reports that 36% of federal civilian employees have a bachelor's…

A: Given, n=119, x=31, α=0.05 Then, p^=31119=0.260504

Q: A school counselor randomly selects a sample of 30 students to investigate the impact of a behavior…

A: Solution-:A school counselor randomly selects a sample of 30 students to investigate the impact of a…

Q: Part of why cocaine is so dangerous is that it blocks dopamine receptors.  Researchers conducted an…

A: Consider the given dataset: Percent_dopamine_blocked rating cocaine high 74 6 40 2 34 1…

Q: What is the mode of the data: 21, 38, 12, 19, 38, 30, 19, 38, 12, 22, 31, 12, 38, 18, 27, 38, 12. 39…

A: Use the definition of mode.  The mode of a data set is the number that occurs most frequently in the…

Q: find 4th percentilefor given data  12,25,32,6,42,16,18,19,15,23,24,28,29,45,6,23

A:

Q: DeAndre and Jonah began arguing about who did better on their tests, but they couldn't decide who…

A: GivenDeAndre earn in science=81.2Jonah earn in Art History=61.9For science Mean(μ)=72.2standard…

Q: The mean of 14 numbers is 49. Removing one of the numbers causes the mean to decrease to 43. What…

A: given data:mean =49n=14 Removing one of the numbers causes the mean to decrease to 43new total…

Q: The mean of 200 items was 50. Later on it was found that two items were wrongly taken as 92 and 8…

A:

Q: A famous study found that once orchestras switched to blind auditions, the number of women hired by…

A: Introduction: It has been observed that the number of women hired by orchestras increased when the…

Q: Over the past several months, customers at Stymie's department store have been asked to fill out…

A: a) given data is  1419192425323539434648505354545454616161727381849025the procedure of calculate the…

Q: Find the percentile rank of a test score of 76 for the data set 70,73,68,83,78,80,89,88,65

A: Solution-: Given data:  70,73,68,83,78,80,89,88,65 We find percentile rank of a test score of 76=?

Q: Describe about Which Level of Significance to choose.

A: The significance level should be selected with close consideration of key factors such as sample…

Q: Mina is waiting in line at the Department of Motor Vehicles (DMV). Her wait time is in the 85th…

A: It is clearly given in statement that at Department of Motor Vehicles waiting line is Mina wait time…

Q: A professor using an open-source introductory statistics book predicts that 60% of the students will…

A: given data, 60% - student will purchase a hard copy of the book,25%- will print it out from the…

Q: Find the percentile rank of a test score of 76 for the data set 70,73,68,83,78,80,89,88,65   FULL…

A: Given data is70,73,68,83,78,80,89,88,65

Q: Explain about the Two Independent Samples.

A: Two samples are said to be independent if the sample values selected from one population are not…

Q: a) Calculate the z-score for Lucas's test grade. z=z= b) Calculate the z-score for Alex's test…

A:

Q: Which of the three measurements, mean, median, or mode, is the most influenced by an outlier value…

A: Outlier in a data set is the value which is much higher than or lower than almost all other values.…

Q: Most adults would erase their personal data from the internet if they could. A software firm survey…

A:

Q: - 0.287). This means ance that a pair of rande

A: here we can see that administrator found no significant difference between mean GPA for male and…

Q: An electronics company wants to gauge public opinion on its products. They send out a business reply…

A: An electronic company wants to gauge public opinion on its product. The company wants the public…

Q: psychologist wanted to know if students in her class were more likely to cheat if they were low…

A: ANSWER:After reviewing the data set, we need to determine whether the observed patterns support or…

Q: Mariah and Amanda began arguing about who did better on their tests, but they couldn't decide who…

A:

Q: A sample of psychology students in MSU-IIT was part of a study that examined their happiness level…

A: From the given information, Sample size n =56 Using Excel function, “=AVERAGE(A1:A7)” the Sample…

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.