In a simple random sample of 30 shoppers at Greedgate Mall, the sample mean amount spent last week was $259.48, with a sample standard deviation s = $39.18. a) Find a 95% confidence interval for the true mean weekly amount spent last week by Greedgate shoppers. ______________________________________ b) Will this interval allow us to conclude that the mean amount spent is less than $275?
Ratios
A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.
Trigonometric Ratios
Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.
6) In a simple random sample of 30 shoppers at Greedgate Mall, the sample
spent last week was $259.48, with a sample standard deviation s = $39.18.
a) Find a 95% confidence interval for the true mean weekly amount spent last week by
Greedgate shoppers.
______________________________________
b) Will this interval allow us to conclude that the mean amount spent is less than
$275? Explain.
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