The age when smokers first start from previous studies is normally distributed with a mean of 13 years old with a population standard deviation of 1.6 years old. A survey of smokers of this generation was done to estimate if the mean age has changed. The sample of 27 smokers found that their mean starting age was 13.3 years old. Find the 90% confidence interval of the mean. < Select an answer p σ² p̂ s σ μ x̄ s² Correct < Do not round in between steps. Round answers to at least 3 decimal places.
The age when smokers first start from previous studies is
< Select an answer p σ² p̂ s σ μ x̄ s² Correct <
Do not round in between steps. Round answers to at least 3 decimal places.
You measure 36 turtles' weights, and find they have a mean weight of 42 ounces. Assume the population standard deviation is 2.3 ounces. Based on this, construct a 99% confidence interval for the true population mean turtle weight.
Give your answers as decimals, to two places
± ounces
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