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Q1) Allen's hummingbird has been examined by zoologist Bill Alther a small group of 15 Allen's hummingbirds has been under study in Arizona. Average weight for these birds is x¯ =3.15 gram. Based on earlier studies, we can suppose that weights of Allen's hummingbirds have normal distribution, with σ=0.33 gram.
a) Determine 80% confidence interval for average weights of Allen's hummingbirds in study regions. Determine the margin of error?
b) What conditions are essential for your computation?
c) Give a short interpretation of the results in content of this problem
d) Sample size. Determine sample size essential for 80% confidence level with maximal error of estimate E=o.o8 for mean weight of hummingbirds.
Now compute the standard deviation for this distribution.
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These can have a large impact on tenure and promotion decisions at many institutions. One particular instructor had ratings in 3 courses in one semester as given by the table below for the statement "The instructor is an excellent teacher.
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Compare the two forecasts computed in (a) and (b), using MAD. Which one should the dealer use for January of the next year?
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group Perform the chi-square test for a uniform distribution at α = .01
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