BTI Method

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#1) Mrs. Kadis owns dump trucks. She has 381 to be exact. If she takes a sample of 37 trucks, and nd they get 14.6 miles per gallon (mpg) with an sd of 6.6 mpg, construct a 90% condence interval for her TOTAL fuel bill if gas costs $2.40 per gallon, and her trucks drive a total (all 381 added together) of 498000 miles in a year. 90% condence interval for TOTAL fuel cost: { , } interpretation: #2) Is vocabulary recall related to listening to Britney Spears music? Recently, a group of MSIHS students, studied this question They rst surveyed 275 students, asking if they listen to a \"little\" Britney, a \"medium\" amount or \"hecka\" Britney. Then they tested those students on 11\"\"- grade level English Literature vocabulary, and classied them as \"passing\" or \"needs improvement\". The results: Music listening frequency: little medium hecka Vocab skill passing 65 62 45 needs improvement 23 33 4? Is there a relationship between listening to Britney and vocabulary recall skill? Run a test at the alpha = .05 level, show all steps. The percent of fat calories that a person in America consumes each day is normally distributed with a mean of about 36 and a standard deviation of 10. Suppose that one individual is randomly chosen. Let X = percent of fat calories. (a) Find the z-score corresponding to 47 percent of fat calories, rounded to 3 decimal places. (b) Find the probability that the percent of fat calories a person consumes is more than 47. (c) Shade the area corresponding to this probability in the graph below. (Hint: The x-axis is the z-score. Use your I- score from part (a), rounded to one decimal place). Shade: |Left of a value . Click and drag the arrows to adjust the values. -2 -1.5 (d) Find the maximum number for the lower quarter of percent of fat calories. Round your answer to 3 decimal places. (e) Sketch the graph and write the probability statement. Edit - Insert* Formats - B / ! A