n people drop their cell phones in a box, then randomly pick their cell phone by putting their hands in the box. Let X be the random variable representing the number of people pulling their cell phones right: a.What is the average value of the random variable X if we know that the first person to draw is the correct one? What is the variance? b.lf we know that 2 people from the first (n-1) people picked up the phone correctly, what is the average of the nth person picking up the phone correctly?

Three university administer the same comprehensive examination to the receipients of MS degree in Business Statistics. From each institution, a random sample of MS receipients was selected, and these receipients were then given to the exam.  The following tabel shows the scores of each student from the three universities Uni A                           Uni B                         Uni C    89.                               60.                            81  95.                                95.                            70  75                                 89                            90  92                                 80                           78  99                                 66 77  At a= 0.01 , test to see if there is a significant difference  in the average scores of students from the three universities Answer needed ASAP.

Show the probability distribution of the following using a chart and ahistogram:  20 out of 30 people at a party arenon-smokers. The random variable isthe number of smokers in a selection of4 partier

Delta limited the Chief Administrative Manager analyzed the number of incoming faxes. Afteran analysis, the manager determined the probability distribution of the number of pages per fax as follows:x1234567P(x)0.050.120.20.30.150.10.08Required:Compute the mean and the variance of the number of pages per fax.

Anyone who has been outdoors on a summer evening has probably heard crickets. Did you know that it is possible to use the cricket as a thermometer? Crickets tend to chirp more frequently as temperatures increase. This phenomenon was studied in detail by George W. Pierce, a physics professor at Harvard. In the following data, x is a random variable representing chirps per second and y is a random variable representing temperature (°F). x 19.8 15.3 20.4 18.1 16.2 15.5 14.7 17.1 y 89.4 73.2 95.3 86.1 78.8 75.2 69.7 82.0 x 15.4 16.2 15.0 17.2 16.0 17.0 14.4 y 69.4 83.3 79.6 82.6 80.6 83.5 76.3           (b) Verify the given sums Σx, Σy, Σx2, Σy2, Σxy, and the value of the sample correlation coefficient r. (Round your value for r to three decimal places.) Σx =   Σy =   Σx2 =   Σy2 =   Σxy =   r =   (c) Find x, and y. Then find the equation of the least-squares line = a + bx. (Round your answers for x and y to two decimal places. Round your answers for a and…

What is assigned randomly?

You are doing research on balance and fitness.  To complete this research you will need a watch with a second hand.  Identify a random sample of n = 12 men and n = 8 women.  You must answer this question: How do you establish that this sample is truly random? Have each subject perform the following task:   Have the subjects stand with their hands at their side, raise one knee, cross their ankle over the other knee, squat and bring their hands palms together in front of their chest. Time the subject until they put their foot back down on the floor.   b) Ask the following questions: i) How many days per week do they exercise? ii) What is their favorite exercise?   You will analyze your data and compute the following statistics for each group:   1) The Mean and standard deviation of the number of seconds the subject stayed balanced 2) The Median number of days per week exercised 3) The Mode of the favorite exercise 4) The 90% confidence interval of the mean   Construct a complete…

In regression analysis if a point has leverage then it must also be influential  a true  b false

ASK YOUR TEACHER Nationally, about 11% of the total U.S. wheat crop is destroyed each year by hail.t An insurance company is studying wheat hail damage claims in a county in Colorado. A random sample of 16 claims in the county reported the percentage of their wheat lost to hail. 14 7 10 11 12 19 14 11 9 8 23 19 13 7 10 7 The sample mean is x = 12.1%. Let x be a random variable that represents the percentage of wheat crop in that county lost to hail. Assume that x has a normal distribution and a = 5.0%. Do these data indicate that the percentage of wheat crop lost to hail in that county is different (either way) from the national mean of 11%? Use a = 0.01. (a) What is the level of significance? State the null and alternate hypotheses. Will you use a left-tailed, right-tailed, or two-tailed test? O Ho: H = 11%; H,: µ 11%; right-tailed O Ho: H + 11%; H,: u = 11%; two-tailed O Ho: H = 11%; H,: u + 11%; two-tailed (b) What sampling distribution will you use? Explain the rationale for your…

In a survey conducted by a reputable marketing agency, 231 of 1000 adults 19 years of age or older confessed to bringing and using their cell phone every trip to the bathroom (confessions included texting and answering phone calls). Complete parts (a) through (f) below. D. The sample size is large. E. Its value may change depending on the individuals in the survey. What is the source of variability in the random variable? A. The sample size B. The individuals selected to be in the study C. The question asked in the survey D. The marketing agency (e) Construct and interpret a 95% confidence interval for the population proportion of adults 19 years of age or older who bring their cell phone every trip to the bathroom. Select the correct choice below and fill in any answer boxes within your choice. (Type integers or decimals rounded to three decimal places as needed. Use ascending order.) OA. There is a % probability the proportion of adults 19 years of age or older who bring their cell…