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missdakotacheyenne
24.06.2020 •
Mathematics
A toy manufacturer wants to know how many new toys children buy each year. Assume a previous study found the standard deviation to be 1.8. She thinks the mean is 5.8 toys per year. What is the minimum sample size required to ensure that the estimate has an error of at most 0.12 at the 80% level of confidence
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Ответ:
The critical value for 80% of confidence interval now can be founded using the normal distribution the significance level would be 20% and the critical value
, replacing into formula (b) we got:
So the answer for this case would be n=369 rounded up to the nearest integer
Step-by-step explanation:
We know the following info given:
The margin of error is given by this formula:
And on this case we have that ME =+0.12 and we are interested in order to find the value of n, if we solve n from equation (a) we got:
The critical value for 80% of confidence interval now can be founded using the normal distribution the significance level would be 20% and the critical value
, replacing into formula (b) we got:
So the answer for this case would be n=369 rounded up to the nearest integer
Ответ:
WHATT EWW
Step-by-step explanation: