Comparing Measures of Center and Variability This Week's High Temperatures (°F)
29, 38, 45, 31, 50, 58, 62
Which measures of center and variability for the
temperatures were lower this week than last week?
Check all that apply.
Last Week's High Temperatures (°F)
mean
44,31,66, 32, 26, 58, 78
median
mode
range
mean absolute deviation
2
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Find the length of cu, the triangles are similar.

Arandom sample of n = 25 observations is taken from a n(µ, σ ) population. a 95% confidence interval for µ was calculated to be (42.16, 57.84). the researcher feels that this interval is too wide. you want to reduce the interval to a width at most 12 units. a) for a confidence level of 95%, calculate the smallest sample size needed. b) for a sample size fixed at n = 25, calculate the largest confidence level 100(1 − α)% needed.

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