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##### stats problems with solution fall 2014

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Question;? Question 1Using the standard normal distribution tables, what is the area under the standard normal curve corresponding to Z ?2.62 is? Question 3A sample was taken of the verbal SAT scores of applicants to a California State College. The following is the five-number summary of the scores: 300, 390, 470, 600, 750. The interquartile range of these scores is ? Question 4In a statistics class with 136 students, the professor records how much money each student has in his or her possession during the first class of the semester. The following is the data collected.Amount No. of Students0-9 6110-19 4420-29 2030-39 540-49 250-59 390-99 1The histogram for this data is ? Question 5A sample of 20 employees from the local Honda plant was obtained and the length of time (in months) worked was recorded for each employee. A stemplot of these data follows. In the stemplot the first number in each row is the stem and the remaining numbers in the row are the leaves.5 2 4 8 9 96 0 3 5 6 7 7 8 97 3 4 7 8 9 989 8The median length of time worked by these 20 employees is? Question 6A sample was taken of the verbal SAT scores of applicants to a California State College. The following is the five-number summary of the scores: 300, 390, 470, 600, 750. About 75% of these students scored above ? Question 7A reporter wishes to portray baseball players as overpaid. Which measure of center should he report as the average salary of major league players?? Question 8When water flows across farm land, some of the soil is washed away, resulting in erosion. An experiment was conducted to investigate the effect of the rate of water flow on the amount of soil washed away. Flow is measured in liters per second, and the eroded soil is measured in kilograms. The data are given in the following table.Flow rate.31.85 1.26 2.47 3.75Eroded soil.82 1.95 2.18 3.01 6.07The association between flow rate and amount of eroded soil is ? Question 9An owner of a home in the Midwest installed solar panels to reduce heating costs. After installing the solar panels, he measured the amount of natural gas used y (in cubic feet) to heat the home and outside temperature x (in degree-days, where a day's degree-days are the number of degrees its average temperature falls below 65 degrees Farenheit) over a 25 month period. He then computed the least squares regression line for predicting y from x and found it to be y = 85 +16x. How much, on average, does gas used increase for each additional degree-day? ? Question 10An owner of a home in the Midwest installed solar panels to reduce heating costs. After installing the solar panels, he measured the amount of natural gas used (in cubic feet) to heat the home and the outside temperature (in degree-days, where a day's degree-days are the number of degrees its average temperature falls below 65 degrees Farenheit) over a 25 month period. He then computed the least squares regression line for predicting the amount of natural gas needed to heat his home based on the outside temperature. The response variable in this model is ? Question 11Because elderly people may have difficulty standing to have their heights measured, a study looked at predicting overall height from height to the knee. Here are data (in centimeters) for six elderly men.Knee height x 57.7 47.4 43.5 44.8 55.2 54.6Height y 192.3 153.3 146.4 162.7 169.1 177.8The least squares regression line for predicting overall height from knee height is y = 42.9 + 2.5x. What is the residual for the observed knee height of 47.4? ? Question 12Using the standard normal distribution tables, the area under the standard normal curve corresponding to ?0.5 5.The P-value for this test is

Paper#61441 | Written in 18-Jul-2015

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