Aconsumer advocacy group is doing a large study on car rental practices. among other things, the consumer group would like to do a statistical test regarding the mean monthly mileage, , of cars rented in the u. s. this year. the consumer group has reason to believe that the mean monthly mileage of cars rented in the u. s. this year is greater than last year's mean, which was miles. the group chooses a random sample of cars rented in the u. s. this year and records their monthly mileages. suppose that the population of monthly mileage of cars rented in the u. s. this year has a standard deviation of miles and that the group performs its hypothesis test using the level of significance. based on this information, answer the questions below. carry your intermediate computations to at least four decimal places, and round your responses as indicated. (if necessary, consult a list of formulas.) what are the null and alternative hypotheses that the group should use for the test

80 points suppose marcy made 45 posts online. if 23 of them contained an image, what percent of her posts had images? round your answer to the nearest whole percent. 54 percent 51 percent 49 percent 48 percent

What are two numbers that add up to -9 and multiply to -10 best answer gets branliest and 100 extra points

(c) compare the results of parts (a) and (b). in general, how do you think the mode, median, and mean are affected when each data value in a set is multiplied by the same constant? multiplying each data value by the same constant c results in the mode, median, and mean increasing by a factor of c. multiplying each data value by the same constant c results in the mode, median, and mean remaining the same. multiplying each data value by the same constant c results in the mode, median, and mean decreasing by a factor of c. there is no distinct pattern when each data value is multiplied by the same constant. (d) suppose you have information about average heights of a random sample of airline passengers. the mode is 65 inches, the median is 72 inches, and the mean is 65 inches. to convert the data into centimeters, multiply each data value by 2.54. what are the values of the mode, median, and mean in centimeters? (enter your answers to two decimal places.) mode cm median cm mean cm in this problem, we explore the effect on the mean, median, and mode of multiplying each data value by the same number. consider the following data set 7, 7, 8, 11, 15. (a) compute the mode, median, and mean. (enter your answers to one (1) decimal places.) mean value = median = mode = (b) multiply 3 to each of the data values. compute the mode, median, and mean. (enter your answers to one (1) decimal places.) mean value = median = mode = --