2+2= help please idk what it is
1 answer:
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Answer:
a
The null hypothesis is
The alternative hypothesis
b
The 95% confidence interval is
Step-by-step explanation:
From the question the we are told that
The population mean is
The sample size is n = 30
The sample mean is
The standard deviation is
Given that the confidence level is then the level of significance is mathematically represented as
=>
Next we obtain the critical value of from the normal distribution table
The value is
Generally the margin of error is mathematically represented as
substituting values
The 95% confidence interval confidence interval is mathematically represented as
substituting values