Poverty and Calcium. Calcium is the most abundant mineral in the body and also one of the most important. The recommended daily allowance(RDA) of calcium for adults is 800 milligrams. A random sample of 20 people with incomes below the poverty level  gives the daily calcium intakes: 686, 433, 743, 747, 993, 994, 1025, 620, 459, 854, 425, 506, 703 770, 802, 790, 785, 459, 745, 802 At the 5% significance level, do the data provides sufficient evidence to conclude that the mean calcium intake of all people with incomes below the poverty level is less that the RDA of 800 milligrams? a) State null and alternative hypothesis b) Test Statistics c) Critical value d) Conclusion

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...