Question
2. In a random sample of 101 teachers in 2012, the mean salary was $56,410, and the standard deviation was $15,000. (a) Construct a 90%
2. In a random sample of 101 teachers in 2012, the mean salary was $56,410, and the standard deviation was $15,000. (a) Construct a 90% confidence interval for the population mean salary. (Use the TInterval procedure on your graphing calculator.) (b) Interpret this confidence interval. (c) Construct a 99% confidence interval for the population mean salary. (d) Which interval is wider? 3. The sodium content (in grams) of 16 randomly selected breakfast cereals are given below. 125 220 210 290 180 80 125 135 140 260 150 180 210 240 230 200 (a) Construct a 90% confidence interval for the population mean sodium content. You may use the TInterval procedure. (b) Interpret this interval.
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Reading, Writing, And Proving A Closer Look At Mathematics
Authors: Ulrich Daepp, Pamela Gorkin
2nd Edition
1441994793, 9781441994790
