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20 Nov
2020

# 1. PXa) What is the standard deviationXb) What is the z-scorec) What is the…

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1. PXa) What is the standard deviationXb) What is the z-scorec) What is the 18thX Attendance at the concerts by the band “Death Cab for Cutie” is a normally distributed random variable Xwith a mean of 13,500. You are told that (≥ 11,500) = .7253.of ?of 17,372?percentileof ?d) What are the two values of Xthat delineate the “84% middle pack” of this random variable?
A newly developed blood test to detect breast cancer is being evaluated by a private company. The company tries out
A newly developed blood test to detect breast cancer is being evaluated by a private company. The company tries out the test on 1000 women with known breast cancer, and of these, 900 have positive test results. The company tests 1000 women without breast cancer, and 20 of these test positive.a) [3] Public health officials want to use this blood test for women who are older than 50 years old. The prevalence of breast cancer in this population is 5 per 1000. What is the overall probability of a positive test result in this population?
The number of seconds XX after the minute that class ends is uniformly distributed between 0 and 60. Round all
The number of seconds XX after the minute that class ends is uniformly distributed between 0 and 60. Round all answers to 4 decimal places where possible.What is the distribution of XX? XX ~ U(,) then the sampling distribution isSuppose that 39 classes are clocked. What is the distribution of ¯xx¯ for this group of classes? ¯xx¯ ~ N(,)What is the probability that the average of 39 classes will end with the second hand between 24 and 27 seconds?
============================================================ The Department of Economic and Community Development reported that, in 2017, the average number of new jobs created per
============================================================ The Department of Economic and Community Development reported that, in 2017, the average number of new jobs created per county was 450. The department also provided the following information regarding a sample of 5 counties in 2018. County New Jobs Created In 2018 A 410 B 480 C 407 D 428 E 400 a. Compute the sample average and the standard deviation for 2018. b. We want to determine whether there has been a significant decrease in the average number of jobs created. Provide the null and the alternative hypotheses. c. Compute the test statistic. d. Compute the p-value; and at the 5% level, test the hypotheses. Assume the population is normally distributed. What is expected?
80 part-time students were asked how many courses they were taking this term. The (incomplete) results are shown below:Part-time Student
Religion and Theology Assignment Writing Service80 part-time students were asked how many courses they were taking this term. The (incomplete) results are shown below:Part-time Student Course Loads# of CoursesFrequencyRelative FrequencyCumulative Relative Frequency1362240.30320Answer the following two questions:What percent of students take exactly three courses? Round to a whole number. Do not include any decimals.___%What percent of students take one or three courses? Round to a whole number. Do not include any decimals.
facebook friends: in a study of facebook users conducted by the pew research center, the mean number of facebook friends
facebook friends: in a study of facebook users conducted by the pew research center, the mean number of facebook friends per user was 245 and the median was 111. if a histogram were constructed for the numbers of facebook friends for all facebook users, would you expect it to be skewed to the right, skewed to the left, or approximately symmetric? explain.How do you determine which way it will be skewed?
7* Marianna is a website designer who wants to determine whether two different home-page formats lead visitors to click on