The population is normally distributed. A random sample of 142 individuals has a mean of 19.9 and a standard deviation o

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answerhappygod
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The population is normally distributed. A random sample of 142 individuals has a mean of 19.9 and a standard deviation o

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The population is normally distributed. A random sample of 142 individuals has a mean of 19.9 and a standard deviation of 4.48. The hypotheses are:
H0: u = 20.5
Ha: u does not equal 20.5
a) identify whether the test statistic if z or t, and calculate it
b) find the p-value
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