An electronics store makes a profit of $69 for every standard DVD player sold and $85 for every portable DVD player sold. The ma
nager's target is to make at least $415 a day on sales from standard and portable DVD players. Write an inequality that represents the numbers of both kinds of DVD players that can be sold to reach or beat the sales target. Let s represent the number of standard DVD players sold and p represent the number of portable DVD players sold. Then graph the inequality.
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Answer:
The margin of error for a 95% confidence interval estimate for the population mean using the Student's t-distribution is of 6.22 ounces.
Step-by-step explanation:
The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So
df = 23 - 1 = 22
95% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 22 degrees of freedom(y-axis) and a confidence level of . So we have T = 2.0739
The margin of error is:
M = T*s
In which s is the standard deviation of the sample.
In this question:
s = 3.
Then
M = 2.0739*3 = 6.22
The margin of error for a 95% confidence interval estimate for the population mean using the Student's t-distribution is of 6.22 ounces.