Jake is a car buff who wants to find out more about the vehicles that students at his school drive. He gets permission to go to the student parking lot and record some data. Later, he does some research about each model of car on the Internet. Finally, Jake makes a spreadsheet that includes each car’s model, year, color, number of cylinders, gas mileage, weight, and whether it has a navigation system.
Who are the individuals in Jake’s study?
The cars which are parked in the parking lot considered as individual in Jake's Study
Here Jake is a car buff who wants to find out more about the vehicles that students at his school drive.
He gets permission to go to the student parking lot and record some data.
As here Jake developed his study on the car data at college parking lot, thus in Jake study Cars has considered as individuals.
You are interested in how much time students spend on the Internet each day. Here are data on the time spent on the Internet (in minutes) for a particular day reported by a random sample of 30 students at a large high school
(a) Construct a histogram of these data. (b) Are there any outliers? Justify your answer. (c) Would it be better to use the mean and standard deviation or the median and )12 to describe the center and spread of this distribution? Why?
A survey was designed to study how business operations vary according to their size. Companies were classified as small, medium, or large. Questionnaires were sent to 200 randomly selected businesses of each size. Since not all questionnaires in a survey of this type are returned, researchers decided to investigate the relationship between the response rate and the size of the business. The data are given in the following two-ways
Which of the following conclusions seems to be supported by the data?
(a) There are more small companies than large companies in the survey.
(b) Small companies appear to have a higher response rate than medium or big companies.
(c) Exactly the same number of companies responded as didn’t respond.
(d) Small companies dislike larger companies.
(e) If we combined the medium and large companies, then their response rate would be equal to that of the small company
We used Census At School’s “Random Data Selector” to choose a sample of Canadian students who completed a survey from
The bar graph displays data on students’ responses to the question “Which of these methods do you most often use to communicate with your friends?”
(a) Would it be appropriate to make a pie chart for these data? Why or why not?
(b) Jerry says that he would describe this bar graph as skewed to the right. Explain why Jerry is wrong.
Oatmeal and cholesterol Do eating oatmeal reduce cholesterol? An advertisement included the following graph as evidence that the answer is “Yes.”
(a) How is this graph misleading?
(b) Make a new graph that isn’t misleading. What do you conclude about the effect of eating oatmeal on cholesterol reduction?
Healthy cereal? Researchers collected data on brands of cereal at a local supermarket. For each brand, the sugar content (grams per serving) and the shelf in the store on which the cereal was located ( = bottom, = middle, = top) were recorded. A dot-plot of the data is shown below. Compare the three distributions. Critics claim that supermarkets tend to put sugary kids’ cereals on lower shelves, where the kids can see them. Do the data from this study support this claim?
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