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1) A landscape design office has started importing a new shrub to use in their designs....

1) A landscape design office has started importing a new shrub to use in their designs. They realized this shrub produces a small and sweet berry and they are interested in informing their clients of the berry, but they are not sure how long it takes the berry to ripen. They select a sample of 10 shrubs in their garden and collect data on the time to ripen. The data has a mean of 39.9 and a standard deviation of 2.77.

a) Would you use the z-value or t-value to construct a confidence level for this data?

math   Statistics-And-Probability   
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Answer #1

a) we should use the t-value to construct the confidence interval.

Because the population standard deviation () is unknown and the sample size is less than 30.

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