Respuesta :
Answer:
(e) The researcher should use a t-distribution because they do not know the true standard deviation of daily sugar intake in Durham county.
Step-by-step explanation:
A t-distribution is used when the true standard deviation (population standard deviation) is unknown. t-distribution uses the standard deviation of the samples.
In this case, it is the sample standard deviation that is known, therefore, the researcher should use a t-distribution.
Answer:
The correct option is option a
The researcher should use a normal distribution because the data come from a simple random sample and the sample is large.
Step-by-step explanation:
The research should use a normal distribution because a simple random distribution was used to get the sample and the sample is large(> = 30).
With the parameters given standard deviation, the sample size, and the population mean, can be used to find the standard score. Which signifies that a normal distribution is the best approach to use.