A simple random sample of 60 items resulted in a sample mean of 80. The populationstandard deviation is s = 15.a. Compute the 95% confidence interval for the population mean.b. Assume that the same sample mean was obtained from a sample of 120 items. Providea 95% confidence interval for the population mean.
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.
A simple random sample of 60 items resulted in a sample mean of 80. The population
standard deviation is s = 15.
a. Compute the 95% confidence interval for the population mean.
b. Assume that the same sample mean was obtained from a sample of 120 items. Provide
a 95% confidence interval for the population mean.
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