A researcher, using data on class size (CS) and average test scores (ATS) from 100 third grade classes, estimate the OLS regression ATS = 520.4 - 5.82 times CS, R^2 = 0.8, SER = 11.5

a) Suppose a classroom has 20 students. What is the regression's prediction for that classroom's average test score?

(b) Last year a classroom had 19 students, and this year it has 21 students. What is the regression's prediction for the change in the classroom average test score?

(c) The sample average class size across the 100 classrooms is 21.4 What is the sample average of the test scores across the 100 classrooms?

(d) What is the sample standard deviation of the test scores across the 100 classrooms?

The weight of 46 new patients of a clinic from the year 2018 are recorded and listed below. construct a frequency distribution, using 7 classes. then, draw a histogram, a frequency polygon, and an ogive for the data, using the relative information from the frequency table for each of the graphs. describe the shape of the histogram. data set: 130 192 145 97 100 122 210 132 107 95 210 128 193 208 118 196 130 178 187 240 90 126 98 194 115 212 110 225 187 133 220 218 110 104 201 120 183 124 261 270 108 160 203 210 191 180 1) complete the frequency distribution table below (add as many rows as needed): - class limits - class boundaries - midpoint - frequency - cumulative frequency 2) histogram 3) frequency polygon 4) ogive