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The mean birth weight of infants in the United States is μ = 3315 grams. Let...

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, σ2), where μ and σ2 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 H0: μ = 3315 against the alternative hypothesis H1: μ > 3315 at α = 0.05.

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

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