Hypothesis Testing using z-test

What is the standard error of the mean for a distribution of scores where the standard deviation for the population = 15 and the size of the sample = 100?
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The Z test is appropriate statistical test when sample size is
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A test is conducted for H0: μ = 34, with σ = 5. A sample of size 100 is selected. The standard error of the sampling distribution is
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A test is conducted for H0: μ = 20, with σ = 4. A sample of size 36 has sample mean as 21.4. The test statistic is
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A test is conducted for H0: μ = 50 v/s. H1: μ > 50. The test statistic is 2.46. The p‐value is
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