On Rhea's twitter account her tweets over the years have averaged about 35 likes per tweet with a standard deviation of 10. Several of here tweets have recently gone viral. Rhea's last 20 tweets have been averaging 50 likes per tweet with a standard deviation of 5. Rhea wants to know if her recent viral tweets are increasing her average likes.  How do we use a Z-Test to test to calculate the data and determine if we reject or fail to reject the null hypothesis?

Q: (d) Find the p-value. (Round to three or more decimal places.) (e) Can we conclude that the mean IQ…

A: Given that  Sample size n =21 Sample mean =115 Standard deviation=11

Q: The lengths of the songs available for download on a website are normally distributed, with a mean…

A: Obtain the percent of the songs available for download on the website. The percent of the songs…

Q: It takes an average of 14.5 minutes for blood to begin clotting after an injury. An EMT wants to see…

A: As per our guidelines we can solve first three sub part of question and rest can be reposted.…

Q: It takes an average of 8 minutes for blood to begin clotting after an injury. An EMT wants to see if…

A:

Q: The mean marathon finishing time for men and women was 268 minutes and 280 minutes respectively.…

A: From the given information, The mean marathon finishing time for men and women was 268 minutes and…

Q: u and your friend have recently taken two different standardized mathematics exams. You scored 92 on…

A: The mean = 100The standard deviation = 10

Q: Joe and peter each take 10 swings at a baseball. Joe hits a baseball an average of 290 feet with a…

A: Given information- We have given that Joe and Peter each take 10 swings. Joe hits a baseball an…

Q: The weights of men in their 30s are normally distributed with a mean of 190 pounds and a standard…

A: From the provided information, Population mean (µ) = 190 pounds Population standard deviation (σ) =…

Q: The studernt scored the same on both tests. O B. The student scored better on the mathematics test.…

A: Given : For geography test student score, x = 68.0 population mean, μ = 80.0…

Q: he effects of mentoring on intelligence scores. He wanted to know as a baseline what the averag

A: mean(μ)=100standard deviation(σ)=16  n=50    let X~N(100,16)

Q: Suppose that 35% of all adults in a population would say "good" and 65% would say "bad" if they were…

A: Given Data: p=0.35 n=1000

Q: Lazurus Steel Corporation produces iron rods that are supposed to be 36 inches long. The machine…

A: Finding critical value, using z-table distribution:Link:…

Q: Word-e and NexText are two social media apps in which users can post messages in text. The character…

A: GivenElsa's last post on word-e was 233Mean(μ)=289standard deviation(σ)=45Isabel's last post on…

Q: The average score on the Stats midterm was 70 points with a standard deviation of 6 points,…

A: Given that.   X~N( μ , ?)   μ=70    , ?=6  , Z-score = -1   Z-score =( x - μ )/?

Q: Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8 inches. Find the…

A: Given Information: Mean μ=69.0 inches Standard deviation σ=2.8 inches. To find the z-score of a man…

Q: It takes an average of 8 minutes for blood to begin clotting after an injury. An EMT wants to see if…

A: Given The data is as follows: Pop. mean, μ=8Sample size, n=62Sample mean, x¯=7.8Sample sd,…

Q: C. The test statistic (t (please show your answer to 3 decimal places.) d. The p-value = (Please…

A: We have to test that if mean time is more than 2.06

Q: Consider two investment options: Stock A and Stock B. Every $100 invested in Stock A yields a return…

A: The standard deviation for the portfolio is a function of the standard deviations of the assets that…

Q: The average age of senators in the 108th Congress was 60.5 years. If the standard deviation was 13.5…

A:

Q: Lazurus Steel rporation produces iron rods that are supposed to be 36 inches long. The machine that…

A:

Q: c. The test statistic | (please show your answer to 2 decimal places.) d. The p-value = places.)…

A: C. The pooled estimate is, sp=n1-1s12+n2-1s22n1+n2-2=57-192+42-110257+42-2=8,63697=89.0309=9.4356…

Q: A paper reported that for a group of 76 college students, the average number of responses changed…

A: The mean number of responses changed from correct answer to incorrect answer on a test The standard…

Q: Pyramid Lake is en the Paiute andan Reservation in Nevada. The lake is famous for cuthreat trout.…

A: a)   Assume that μ is the true mean length of trout caught in Lake P.

Q: once, so that they na standard deviat

A: Alex cuts four sticks one at a time and their lengths are independent  with mean = 8 and Standard…

Q: The mean life of a battery is 55 hours with a standard deviation of 6 hours. The manufacturer…

A:

Q: Database A contains 40 data items and is made up with an equal number of the values of 0 and 100 and…

A: Measure of central tendency measures the central or average value of a dataset. Measured of…

Q: A set of math test scores has a mean of 70 and a standard deviation of 8.  A set of English test…

A: Consider that the mean and standard deviation of a random variable x are µ and σ, respectively.…

Q: Block 101 got a mean of 87.5 with a standard deviation of 3.2 while Block 102 got a mean of 85.1…

A:

Q: ou find the standard deviation in the most easiest way?

A: The standard deviation is used to calculate the variability of the data set. It tells us about the…

Q: Lazurus Steel Corporation produces iron rods that are supposed to be 36 inches long. The machine…

A:

Q: The scores on two standardized tests are normally distributed. The first test had a mean of 50 and a…

A: Let I will need score = k on the second test to equal a score of 62 on the first test.  z score of…

Q: It takes an average of 8 minutes for blood to begin clotting after an injury. An EMT wants to see if…

A: Solution:- from given information claim:  if the average of 8 minutes will increase if the patient…

Q: A study was done for the job satisfaction. In the first study, an Engineer was score 72 with a mean…

A: Given data, For first studyScore (x)=72μ=80σ=12For second studyScore (x)=19μ=20σ=5

Q: The highway mileages of 147 cars are in a file named CARS2.+ These cars are 2003 models. Find the…

A: Mean Formula The mean formula is defined as the sum of the observations divided by the total number…

Q: Lazurus Steel Corporation produces iron rods that are supposed to be 36 inches long. The machine…

A:

Q: It takes an average of 8 minutes for blood to begin clotting after an injury. An EMT wants to see if…

A:

Q: Americans (on average) individually eat 16 pounds of seafood each year with a standard deviation of…

A: Given that   x̄ = 14 , μ = 16 , ? = 7 , n = 4

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Q: The Richard family has twins Ron and Rebecca. Both Ron and Rebecca graduated from college 2 years…

A: Let X for  Ron earning from college 2 years ago X=$60,000, μx=$70,000, σx=$5,000Y=$60,000,…

Q: A half-century ago, the mean height of women in a particular country in their 20s was 63.1 inches.…

A:

Q: To determine whether people are contributing more to their IRA’s in 2004 compared to 2001 a sample…

A:

Q: On a Physicians Licensure Exam with a population mean of 83 and standard deviation of 8. Jenny…

A: It is given that Mean = 83, Standard deviation 8