Question

A market research company wishes to know how many energy drinks adults drink each week. They want to construct a 98% confidence interval for the mean and are assuming that the population standard deviation for the number of energy drinks consumed each week is 1.3. The study found that for a sample of 1133 adults the mean number of energy drinks consumed per week is 7.1 . Construct the desired confidence interval. Round your answers to one decimal place. Lower endpoint? Upper endpoint?

Answer #1

Sample mean =7.1

Population standard deviation=1.3

Sample size=1133

Level of significance =1-0.98=0.02

Z critical value (by using Z table)=2.326

Confidence interval formula is

=(7.01,7.19)

Lower confidence limit =7.0

Upper confidence limit =7.2

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Q-10 (1 of 1)
A soft drink manufacturer wishes to know how many soft drinks
adults drink each week. They want to construct a 95% confidence
interval for the mean and are assuming that the population standard
deviation for the number of soft drinks consumed each week is 1.1.
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informed them that a previous study found the mean to be 7.3 energy
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minimum sample size required to create the specified confidence
interval? Round your answer up to the next integer.

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