Two conditions under which we can assume that the sample means follow a normal distribution are as follows:
1). If the sample size is large enough, n greater than or equals 30, the sampling distribution is approximately normal regardless of the shape of the population.
2). In order to be considered a normal distribution, a data set (when graphed) must follow a bell-shaped symmetrical curve centered around the mean.
To learn more about Normal Distributions visit:
brainly.com/question/4079902
#SPJ4
Answer:
Step-by-step explanation:
Information given
represent the sample mean of amount of liquid
represent the standard deviation
sample size
represent the value that we want to check
t would represent the statistic (variable of interest)
represent the p value for the test (variable of interest)
System of hypothesis
We want to verify if the true mean for the amount of liquid is lower than 12 ounces, and the hypothesis are given by:
Null hypothesis:
Alternative hypothesis:
The statistic is given by:
(1)
Replacing we got:
The salary before the increase was $48000.
Ummmm I’m not sure but ya