σ = 914x = 145 mg/g.(a) Give a 90% confidence interval for the mean cellulose content in the population. (Round your answers to two decimal places.)
(b) A previous study claimed that the mean cellulose content was μ = 140 mg/g, but the agronomist believes that the mean is higher than that figure. State H0 and Ha.
H0: μ < 140="" mg/g; ha: μ ="140">
H0: μ = 140 mg/g; Ha: μ ≠ 140 mg/g
H0: μ = 140 mg/g; Ha: μ < 140="">
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