Table 2 on page 2152 gives point and confidence interval estimates of the RR for different groups of people and different types of activities. Consider the characteristic of gait speed, which is broken down into 3 categories: slow, middle, and fast. Why are the RR's for the middle category all exactly 1?

Do Construct a confidence interval on a slope?

why is one standard error unit not a good choice for the error bars that relate to the trendline?

1) Which is relatively better: a score of 88 on a Psychology test or a score of 45 on an Economics test? Scores on the Psychology test have a mean of 92 and a standard deviation of 10. Scores on the Economics test have a mean of 57 and a standard deviation of 5. Use measures of relative position to answer this exercise (Z-score).

Newborn babies: A study conducted by the Center for Population Economics at the University of Chicago studied the birth weights of 607 babies born in New York. The mean weight was 3310 grams with a standard deviation of 910 grams. Assume that birth weight data are approximately bell-shaped. Part 1 of 3 (a) Estimate the number of newborns whose weight was less than 4220 grams. Approximately of the 607 newborns weighed less than 4220 grams. Part 2 of 3 (b) Estimate the number of newborns whose weight was greater than 1490 grams. Approximately of the 607 newborns weighed more than 1490 grams. Part 3 of 3 (c) Estimate the number of newborns whose weight was between 3310 and 5130 grams. Approximately of the 607 newborns weighed between 3310 and 5130 grams. Check Answer Save For Later Submit Assignme

You believe that adults become more creative as they get older, based off a moderately positive correlation between age and creativity found on among a university freshman sample - what is the most striking problem with trying to measure correlation with this description? (outliers, restriction of range, nonlinear relation, inferring causation)

please complete the blank problem and or ones with a red x next to it not ones with a green check next to please

For each scenario, indicate whether the parameter of interest is one proportion , a difference in two proportions , one mean (μ), a difference in means from separate samples , or the mean difference from matched pairs data,  .  Each answer can be selected once, more than once, or not at all. A tire manufacturer tested the braking performance of one of its tire models on a test track, interested in how tires perform under both wet and dry pavement conditions. The company tried the tires on 18 different car models, recording the stopping distance for half of them on wet pavement and the other half of dry pavement.   Student Computing Services surveys a random sample of students to compare the percent of students that have PCs to the percent of students that have Macs.    Married couples are asked about the number of hours of sleep they get each night. We want to see if husbands get more sleep than their wives.   36 of 75 patients receiving a treatment experienced pain relief, while only…

Researchers are looking to see what proportion of students will report cheating if they see it happen. A SRS of 172 undergraduates is collected and 19 respond that they would report cheating if they saw it happen. What is the point estimator?