Math Quiz

Math 103 quiz 4 chapter 8 2021c Upload file(s) as “Last Name Quiz 4” etc

Open book & notes, can use calculating device, formula sheets + extra paper. Use formula sheets including Normal distribution (z) tables. If completing problems manually, show work for credit. – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 1. Use this data set { 65, 38, 53, 62, 44, 87, 27, 78, 21, 18, 60, 78, 2, 44 } and find the…

a) median b) mode

( Round answers to a few decimals (1 or 2) Show work if NOT using your calculator) c) mean d) sample standard deviation

bonus 1 (+0.1%) use the above data & find the Range… (+0.1%) & Midrange

2 a) Use the data below to make a scatter plot Hint: count gridlines (blocks) by 1→

x 5 2 1.5 5.5 7 4 3.4

y 1 4 6 2 2.5 1.3 2.7

What kind of linear correlation seems to exist: b) positive, negative, or none?

3. A fish species has normally distributed weights with standard deviation 2.9 and mean = 22.5 lbs. Show these 3 parts for each: ÀF︂ill in the appropriate formula & show the calculated z. ÁNext, round it up (or down) to the closest z-value (2 decimals) listed in the N-distribution tables, and write that value. ÂFind the # using the table (show all 4 digits, % or decimal).

a) What is the percentage (%) of data less than 22? b) what is the % of data greater than 26?

c) what is the % of data between 21 and 28.5?

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