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Bridge to Math 119 #10 Slope and y-intercept HERE AND NOW PROBLEMS FROM Math 119 In order to gauge public opinion about how to handle Iran's growing nuclear program, a research group surveyed 1001 American men by telephone and asked them to rate the threat Iran's nuclear program poses to the world on a scale of 1 to 10. Describe the population, sample, population parameters, and sample statistics. 3. Determine whether each of the following studies is an observational study or an experiment. If the study is an experiment, identify the control and treatment groups, and discuss whether single- or double-blinding is necessary. If the study is observational, state whether it is a case-control study, and if so, identify the cases and controls. a. In a study of the effects of magnets on back pain, some participants were treated with magnets while others were given nonmagnetic objects with a similar appearance. The magnets did not appear to be effective in treating back pain. b. A study of 2844 runners looked for relationships between specific types of running injuries and variables such as height, weight, body mass index, age, and running history.Bridge to Math 119 #10 Slope and y-intercept 4. The following are the scores for a class of 22 students on a recent mathematics exam. 55, 57,58, 59, 61, 65, 66, 68, 69, 70, 71, 72, 78, 78, 78, 78, 78, 82, 83, 84, 91, 98 Create a frequency table below. Include both frequency and relative frequency and use bins of size 10. Round any relative frequencies to three decimal places. Scores Frequency Relative Frequency 50-59 150 60-69 70-79 80-89 82,83.04 90-99 91, 98 thousand sands). problemBridge to Math 119 #10 Slope and y-intercept In the real world, linear functions are used to model a variety of situations. In statistics, for example, we use linear equations as a way to describe the relationship between two variables. One way that we understand how two variables interact with each other is to look at the slope of the line we use to model the relationship. Below you will get some practice examining a line that models the relationship between two variables. 1. This graph shows the concentration of a substance, in parts per million (ppm), as a function of time, in days Concentration (ppm) 10 12 14 16 Time (days) a. What is the rate of change (slope)? b. By how much does the concentration drop over the space of 6 days? c. Find the initial value of the concentration d. Write an equation representing concentration, c, as a function of time, t. e. Use the equation to predict the concentration on day 13