-A political scientist surveys 77 of the current 146 representatives in a state’s congress. What is the size of the sample? -The average height of young adult males has a normal distribution with standard deviation of 2.2 inches. You want to estimate the mean height of students at your college or university to within 1.4 inch with 93% confidence. How many male students must you measure? -You plan to conduct a survey on your college campus to learn about the political awareness of students. You want to estimate the true proportion of college students on your campus who voted in the 2016 presidential election with 95% confidence and a margin of error no greater than 1.2 percent. How many students must you interview?
An instructor has decided to introduce a greater component of independent
Question An instructor has decided to introduce a greater component of independent study into an intermediate macroeconomics course, as a way of motivating students to work independently and think more carefully about the course material. A colleague cautions that a possible consequence may be increased variability in student performance. However, the instructor responds that she would expect less variability. From her records, she found that in the past, student scores on the final exam for this course followed a normal distribution with standard deviation 18.2 points. For a class of twenty five students using the new approach, the standard deviation of scores on the final exam was 15.3 points. Assuming that these twenty five students can be viewed as a random sample of all those who might be subjected to the new approach, test the null hypothesis that the population standard deviation is at least 18.2 points against the alternative that it is lower. Use α=0.05. Find a p-value. Interpret your results.
As a member of your college newspaper, you’ve been asked to work on
Question Get Answer As a member of your college newspaper, you’ve been asked to work on a story about the long held myth of the “Freshman 15”. This is an urban legend that college students gain an average of 15lbs over the course of their freshman year. Your project is to perform statistical analysis and to create charts/tables displaying the data. You will then write up a report summarizing your findings. This will include tables and charts to display the statistics.
Get Answer Please answer all parts:
theta = 0.7869907 (just in case)
The plot of the sampling distribution of the likelihood
Question Get Answer Please answer all parts:
theta = 0.7869907 (just in case)
The plot of the sampling distribution of the likelihood ratio statistic for n=30 is here: a) For Binomial data the likelihood ratio statistic is a discrete or continuous random variable? b) How well does the Chi-squared(1) probability density function agree with the sampling distribution of the likelihood ratio statistic as approximated by the relative frequency histogram? What are the reasons for this?
It is believed that a stock price for a particular company will grow
Question It is believed that a stock price for a particular company will grow at a rate of $5 per week. An investor believes the stock won’t grow as quickly. The changes in stock price is recorded for ten weeks and are as follows: $4, $3, $2, $3, $1, $7, $2, $1, $1, $2. Perform a hypothesis test using a 5% level of significance. 1. Determine what type of test this is, A, B or C? A: Single population mean with standard deviation known. B. Single population mean with standard deviation not known. C. Single population proportion2. Identify the null hypothesis, A, B, C or D? A. μ
Using SPSS This exercise requires the use of a computer package. The
Question Get Answer Using SPSS This exercise requires the use of a computer package. The article “Movement and Habitat Use by Lake Whitefish During Spawning in a Boreal Lake: Integrating Acoustic Telemetry and Geographic Information Systems” (Transactions of the American Fisheries Society : 939-952) included the accompanying data on 17 fish caught in 2 consecutive years.Year 1 Fish Number Weight (g) Length (mm) Age (years) Year 1 776 410 9 2 580 368 11 3 539 357 15 4 648 373 12 5 538 361 9 6 891 385 9 7 673 380 10 8 783 400 12Year 2 9 571 407 12 10 627 410 13 11 727 421 12 12 867 446 19 13 1042 478 19 14 804 441 18 15 832 454 12 16 764 440 12 17 727 427 12 a. Fit a multiple regression model to describe the relationship between weight and the predictors length and age. y^= -511 3.06 length – 1.11 ageb. Carry out the model utility test to determine whether at least one of the predictors length and age are useful for predicting weight.
Explain whether each of the following constitutes a population or
Question Explain whether each of the following constitutes a population or a sample. a) Pounds of bass caught by all participants in a bass fishing derby b) Credit card debts of 100 families selected from a city c) Number of home runs hit by all Major League baseball players in the 2009 season d) Number of parole violations by all 2147 parolees in a city e) Amount spent on prescription drugs by 200 senior citizens in a large city
6. The California Mega Millions requires picking 5 different numbers
Question 6. The California Mega Millions requires picking 5 different numbers from 1 to 70 and then a sixth number from 1 to 25. How many different lottery tickets are possible?3. Compute P(Ac ) for 30 people. (Hint: If you have trouble figuring this out for 30 people, then try to solve it for 3, 5, or 6 people first, then see if you notice a pattern that will help you answer the above question.)4. Compute P(A) for 30 people. 5. What is the minimum number of people you need in a room for P(A) ≥ .5?
A local mattress manufacturer wants to know if its manufacturing process
Question A local mattress manufacturer wants to know if its manufacturing process is in or out of control and has hired you, a statistics expert in the field, to analyze its process. Specifically, the business has run 20 random samples of size 5 over the past month and has determined the mean of each sample. -Determine the estimate of the mean when the process is in control. -Assuming the process standard deviation is .50 and the mean of the process is the estimate calculated in Question 1, determine the Upper Control Limit (UCL) and the Lower Control Limit (LCL) for the manufacturing process. -Explain the results to the vice-president of the mattress manufacturer focusing on whether, based on the results, the process is in or out of control.Data : https://riosalado.coursearc.com/index.php/download_file/view/8260/12397/Sample #1234567891011121314151617181920Mean of Sample95.7295.4495.4095.5095.5695.7295.6095.2495.4695.4495.8095.2094.8295.7895.1895.3295.0895.2295.0495.48
A project conducted by the Australian Federal Office of Road Safety
Question Get Answer A project conducted by the Australian Federal Office of Road Safety asked people many questions about their cars. One question was the reason that a person chooses a given car, and that data is in table #11.2.8 (“Car preferences,” 2013).Safety: 84 Reliability:62 Cost:46 Performance:34 Comfort:47 Looks:27Do the data show that the frequencies observed substantiate the claim that the reasons for choosing a car are equally likely? Test at the 5% level.
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