# Statistics assignment help

**for large random samples**follows a bell-shaped curve

**only if**the individual population values follow a normal distribution. (

*Hint:*see the “Conditions for the Rule for Sample Means”).

*all*men will lose between 6.4 and 11.2 pounds.

*difference*between two population means is

**–4.31 to 0.76**, then we may conclude with high confidence that the two population means have different values.

About 95% of the weights for individual raccoons in this population fall between what two values?

About 95% of the weights for individual raccoons in this population fall between what two values?

About 95% of the mean weights from samples of size 25 raccoons from this population fall between what two values?

The *Baltimore Sun* (Haney, 21 February 1995) reported on a study by Dr. Sara Harkness, in which she observed the sleep patterns of 6-month-old infants. She found that a sample of n = 49 infants in the U.S. slept an average of 13 hours per day, and that the standard deviation of this sample was 0.5 hours.

Compute a 90% confidence interval for the mean sleep time per day for 6-month-old infants in the U.S.

*Show your work and express your answer using exactly two (2) decimal places.*

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