A 37 bag sample had a mean of 421 grams. Assume the population standard deviation is known to be 29. A level of significance of
1 answer:
Answer:
Step-by-step explanation:
- A null hypothesis is a type of hypothesis that is used in statistics that assumes there is no difference between particular characteristics of a population wheres the alternative hypothesis shows that there is a difference.
Given: A 37 bag sample had a mean of 421 grams.
Let be the population mean.
Then, the null hypothesis would be:
whereas the alternative hypothesis would be:
You might be interested in
<h2>Answer with explanation:</h2>
Confidence interval for mean, when population standard deviation is unknown:
, where = sample mean
n= sample size
s= sample standard deviation
= Critical t-value for n-1 degrees of freedom
We assume the population has a normal distribution.
Given, n= 19 , s= 3.8 ,
A) Critical t value for and degree of 18 freedom
= 2.8784
B) Required confidence interval:
Lower bound = 19.9 years
Uppen bound = 24.9 years
C) Interpretation: We are 99% confident that the true population mean of lies in (19.9, 24.9) .