Question

The mean birth weight of infants in the United States is μ =
3315 grams. Let X be the birth weight (in grams) of a randomly
selected infant in Jerusalem. Assume that the distribution of X is
N(μ, σ^{2}), where μ and σ^{2} are
**unknown**. 25 new-born infants randomly selected in
Jerusalem yielded a sample mean of 3515 grams and a standard
deviation of s = 500 grams. Use the data to test the null
hypothesis H_{0}: μ = 3315 against the alternative
hypothesis H_{1}: μ > 3315 at α = 0.05.

Answer #1

Here sample size is small(n<30). So t test hypothesis is used.

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α = 0.05, what is the critical t-value?
Multiple Choice
−2.365
±1.96
±2.365
±2.447

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a) Find p(x < 3000) probability =
b) Find p(x > 4500) probability =
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3900)
probability =
c) p(3000 < x <
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probability =
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(b) Another definition of a premature baby is...

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