Create a scatterplot with MPG.city on the vertical axis, Engine Size on the horizontal axis. Add labels to both axes as well as a main title; set blue as the color of the points. Finally, using the abline() function, add a regression line to the scatterplot.
A nurse measured the blood pressure of each person who visited her clinic. Following is a relative-frequency histogram for the systolic blood pressure readings for those people aged 25 to 40. Use the histogram to answer the question. The blood pressure readings were given to the nearest whole number. <img src="https://sciemce.com/files/4/ppg__ghgh0521191631__f1q63g1.jpg" alt="" style="vertical-align: 0.0px;" height="272" width="221" />Given that 200 people were aged between 25 and 40, approximately how many had a systolic blood pressure reading less than 130?
Nonparametric statistical methods generally specify hypotheses in terms of population distributions rather than parameters such as means and standard deviations
Assignable cause variation refers to variation in the output of a process that is naturally occurring, expected, and that may be the result of random causes
Gun control Two friends who strongly disagree on whether there should be stricter regulation of guns in this country want to conduct a poll of the students in their school to see which side most students agree with. Each came back with a different version of the question they want to ask.Version 1: Do you think the government should respect our 2nd Amendment rights and allow law-abiding citizens to own guns?Version 2: In the wake of recent mass shootings, should laws be passed to keep guns out of the hands of people with a history of violence?a. Which version would make it seem like people oppose stricter gun regulation? What kind of bias is this?b. Is the version you did not pick in part a less biased?c. Is it reasonable for a person to respond 'yes' to both questions?
The number of road construction projects that take place at any one time in a certain city follows a Poisson distribution with a mean of 7. Find the probability that more than four road construction projects are currently taking place in the city
A mid-sized company has decided to implement an enterprise resource planning (ERP) system, and management suspects that many of its employees are concerned about the planned implementation. Managers are considering holding informational workshops to help decrease anxiety levels among employees. To determine whether such an approach would be effective, they randomly select 16 employees to
Solve the problem.In the game of craps two dice are rolled and the up faces are totaled. If the person rolling the dice on the first roll rolls a 7 or an 11 total they win. If they roll a 2, 3, or 12 on the first roll they lose. If they roll any other total then on subsequent rolls they must roll that total before rolling a 7 to win. What is the probability of winning on the first roll?
The number of traffic accidents that occur on a particular stretch of road during a month follows a Poisson distribution with a mean of 7.1. Find the probability of observing exactly three accidents on this stretch of road next month
A random sample of 400 men and 400 women was randomly selected and asked whether they planned to attend a concert in the next month. The results are listed below. Perform a homogeneity of proportions test to test the claim that the proportion of men who plan to attend a concert in the next month is the same as the proportion of women who plan to attend a concert in the next month. Use α = 0.05.
A sociologist develops a test to measure attitudes about public transportation, and 27 randomly selected subjects are given the test. Their mean score is 76.2 and their standard deviation is 21.4. Construct the 95% confidence interval for the mean score of all such subjects.
If Z is a standard normal random variable, the area between z = 0.0 and z = 1.30 is 0.4032, while the area between z = 0.0 and z = 1.50 is 0.4332 . What is the area between z = –1.30 and z = 1.50?
A two-tailed test is conducted at the 10% significance level. What is the z-score closest to zero in the list that will result in rejection of the null hypothesis?
A weight-lifting coach claims that a weight-lifter can increase strength by taking vitamin E. To test the theory, the coach randomly selects 9 athletes and gives them a strength test using a bench press. The results are listed below. Thirty days later, after regular training supplemented by vitamin E, they are tested again. The new results are listed below. Find the critical value for a Wilcoxon
When two or more of the predictor variables are highly correlated with one another, adding or deleting a predictor variable may cause significant changes in the values of the other regression coefficients
Determine the slope and the y-intercept. Use the slope and the y-intercept to graph the equation.y = 2<img src="https://sciemce.com/files/4/ppg__erwr0521191753__f1q53g1.jpg" alt="" style="vertical-align: 0.0px;" height="200" width="200" />
A study investigates whether the mean number of industrial accidents is lower in small workplaces (Sample 1) as compared to large workplaces (Sample 2). The test of significance will be a:
Explain why the last plan suggested above, selecting the ten trees closest to the parking lot, might be biased. Be sure to name the kind(s) of bias you describe and link it to the variable of interest
The longer you play a video game, the higher score you can usually achieve. An analysis of a popular game found the following relationship between the hours a player has played a game and their corresponding high score on that game.
A large shipment of TV sets is accepted upon delivery if an inspection of ten randomly selected TV sets yields no more than one defective TV. Find the probability that this shipment is not accepted if 10% of this shipment is defective
A stem-and-leaf plot describes two-digit integers between 30 and 80 . For one of the classes displayed, the row appears as 5|234 . The numerical values being described are 25, 35, and 45
A nurse measured the blood pressure of each person who visited her clinic. Following is a relative-frequency histogram for the systolic blood pressure readings for those people aged between 25 and 40 years. The blood pressure readings were given to the nearest whole number. Approximately what percentage of the people aged 25 -40 had a systolic blood pressure reading between 110 and 139 mm Hg
A statistics teacher wanted to see whether there was a significant difference in age between day students and night students. A random sample of 35 students from each group was selected. The data are given below. Use the Wilcoxon rank sum test to test the claim that there is no difference in age between the two groups. Use α = 0.05.