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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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Your Turn

1. Calculate the standard error of the mean when …
a. σ = 10, n = 15
b. σ = 4.7, n = 12
c. σ = 7, n = 20
2. A population has a mean value of 16.0 and a standard deviation of 7.5. Calculate the following with a sample size of 9.
a. P[x≤17]
b. P[x>18]
c. P[14.5≤x≤16.5]
3. Calculate the standard error of the proportion when …
a. p = 0.25, n = 200
b. p = 0.42, n = 100
c. p = 0.06, n = 175
4. A population proportion has been estimated at 0.32. Calculate the following with a sample size of 160.
a. P[ps≤ 0.30]
b. P[ps>0.36]
c. P [0.29 ≤ps ≤ 0.37]
5. A hypothetical statistics author is obsessed with making 10-foot putts. Each day that he practices, he putts 60 times and counts the number he makes. Over the ...

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