Using the t-distribution, as we have the standard deviation for the sample, it is found that the 95% confidence interval for the number of units students in their college are enrolled in is (11.7, 12.7).
<h3>What is a t-distribution confidence interval?</h3>
The confidence interval is:

In which:
is the sample mean.
- s is the standard deviation for the sample.
The critical value, using a t-distribution calculator, for a two-tailed <em>95% confidence interval</em>, with 49 - 1 = <em>48 df</em>, is t = 2.0106.
Hence:


The 95% confidence interval for the number of units students in their college are enrolled in is (11.7, 12.7).
More can be learned about the t-distribution at brainly.com/question/16162795
Answer:
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Explanation:
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The percentage increase of the change in price is gotten as; 48%
<h3>How to calculate percentage price increase?</h3>
We are given;
Old Cost Price = $20
New Cost Price = $9.60
Thus, the increase in price is;
29.60 - 20 = $9.60
The percentage increase is;
Percent increase = (29.60 - 20)/20 * 100%
Percentage Increase = 9.60/20 * 100%
Percentage Increase = 0.48 * 100% = 48%
Complete Question is;
The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? What is the percentage increase?
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