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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
7* Marianna is a website designer who wants to determine whether two different home-page formats lead visitors to click on different numbers of links. She writes two scripts: one to randomly display one of the home pages and another to record the page displayed and the number of links clicked. For the sample for home page A, the 140 visitors clicked an average of 8.5 links with a standard deviation of 2.1. For the sample for home page B, the 109 visitors clicked an average of 7.9 links with a standard deviation of 1.9. Let μ1 be the population mean number of clicks for home page A, and let μ2 be the population mean number of clicks for home page B. Marianna assumes the population standard deviations are equal and uses the alternative hypothesis Ha: μ1−μ2≠0 . If the test statistic is t≈2.36 and the number of degrees of freedom is 247, what is the p-value for this hypothesis test?
For the following data how do I construct a frequency distribution, showing lower and upper class limits, frequency, cumulative frequency,
For the following data how do I construct a frequency distribution, showing lower and upper class limits, frequency, cumulative frequency, relative frequency, cumulative relative frequency and midpoints using 6 intervals.10, 13, 14, 15, 16, 19, 22, 23, 25, 28, 29, 33, 37, 39, 42, 47, 48, 54, 55, 59, 62, 69, 75, 78, 81.
1.A new analysis of survey data collected for another purpose is called:a.Content analysisb.Secondary analysis c.Latent analysisd.Historical analysis2.Professor Yee wants to
1.A new analysis of survey data collected for another purpose is called:a.Content analysisb.Secondary analysis c.Latent analysisd.Historical analysis2.Professor Yee wants to do an evaluation study of the effects of a patient education program on patient anxiety. He uses one wing in a hospital for the experiment and compares the results with a similar group of patients in a similar wing in another hospital. Which design would be best?a.Classicalb.Nonequivalent control groupc.Time-seriesd.Factoriale.Posttest-only control group design
I need a risk calculating formula for a specific instance. Consider I have a web application that reports 100 vulnerabilities.
I need a risk calculating formula for a specific instance. Consider I have a web application that reports 100 vulnerabilities. I am receiving a report with 70 High vulnerabilities and 30 Critical vulnerabilities. I need to calculate the risk score considering total number of vulnerabilities, and the occurrence of high and critical vulnerabilities.There are two conditions. We need to give more importance to Critical vulnerabilities and should always consider the number of high vulnerabilities. The risk score should be between 0-10 with one decimal value (Eg Application A- Risk score 5.5)I usually get a report of vulnerabilities from around 220 applications and based on the above criteria, I need to decide risk score for all applications. Please help. Any good mathematicians.
1) Given a data set that can be graphed as a standard normal curve… a) What defines the graph? I.e.,
1) Given a data set that can be graphed as a standard normal curve… a) What defines the graph? I.e., what determines the shape of the graph and what is the relationship between these defining characteristics?b) What must be done in order to transform a normal distribution of data into a standard normal distribution based on the same data?c) What is the advantage of having transformed data so that it can be represented by a standard normal distribution?d) We often see data points represented by either x or z. What is the relationship between them?e) Why is the area under the standard normal curve above the mean always the same value?2) A school psychologist wants to determine whether children who live with both parents perform better on school work than children who live with a single parent. She gathers two groups for her comparison, 20 children who live with both parents and another 20 who live with a single parent. The psychologist plans to use scores on a standardized achievement test as an indicator of school performance.a) What statistical test would be appropriate in this case? Explain the rationale for your answer.b) Identify the independent variable in this study.c) Identify the dependent variable in this study.d) Describe a potentially confounding variable and explain how that might affect the conclusions from the study.e) State the null and alternative hypotheses in words.3) A social worker notes that in a population of psychiatric inpatients the ethnic mix seems out of balance with what she has understood to be the ratios in the general population. Respond to the prompts below to show how she might determine whether the inpatient ethnic mix varies from the mix in the general population. a) What statistical test would be appropriate to use here? Explain the rationale for your answer.b) What assumptions would need to be met in order to use the test?c) Describe the data that the test would be based on as either quantitative or qualitative. Explain the rationale for your answer.d) What is an example of how the null and alternative hypotheses for this test could be stated.e) What would the researcher need to know in order to calculate the appropriate test statistic? I.e., what values need to be known or calculated in order to complete the calculation of the test statistic?4) A team of psychologists have developed an experimental treatment program for a learning disorder with the expectation that the treatment would enable recipients to score higher than before on a test of learning ability. To test the treatment, they randomly select a pool of 30 volunteers who have been diagnosed with the disorder and who have volunteered for the treatment program. Following treatment, the participants are retested on the learning ability test and their scores compared to earlier scores.a) What statistical test would be appropriate in this case? Explain the rationale for your answer.b) State the null and alternative hypotheses in words.c) State the null and alternative hypotheses in statistical symbolsd) Would the test be right-tailed, left-tailed or two-tailed? Explain the rationale for your answer.e) Describe a potentially confounding variable and explain how that might affect the conclusions from the study.Describe a potentially confounding variable and explain how that might affect the conclusions from the study.5) A social psychology professor is interested in determining whether cell phone use while driving is related to having received a speeding violation. a) What statistical test would be appropriate to use? Explain the rationale for your answer.b) Suggest how levels of these variables might be arranged in a table.c) What is an example of how the null and alternative hypotheses for this test could be stated.d) Is the statistical test right-tailed, left-tailed or two-tailed? Explain the rationale for your answer.e) Assuming a statistically significant outcome, what’s a statement summarizing the conclusion.

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