2 a no7isnotinthe95ci b 95cixbar196se411980193641038

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Unformatted text preview: sample mean. d. The population mean is known if the entire population is sampled. 2 a. No, 7 is not in the 95% CI. b. 95% CI = x‐bar ± 1.96 (se) = 4.1 ± 1.98 (0.1936) = 4.1 ± 0.38 = (3.72, 4.48). This CI is narrower than the CI above using a smaller n. When the sample size is increased, the margin of error would decrease. c. No, the variable (number of times a week the subject reads a newspaper) is non‐negative and the standard deviation (3.0) is relatively large to the mean value (4.1). The popul...
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This document was uploaded on 03/13/2014.

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