5. A random sample of 30 males between ages 25 – 40 is taken for a health and fitness study. Following are their wieghts in kilograms: 75, 72, 83, 76, 65, 88, 67, 76, 78, 89, 86, 74, 78, 89, 88, 78, 77, 83, 84, 69, 72, 74, 78, 75, 61, 86, 85, 84, 81, 79 It was also asked of them if they exercise daily, and only 13 of them answered yes. Based on the above sample data: (a) What can you conclude about the average weight of males aged 25 – 40 years at 90% confidence level? (b) What is the interval for average weight of this population if you want to make a claim at 98% confidence level? (c) What is the proportion of this population that exercises daily? Give a 95% confidence interval. (d) Now the tricky part: Suppose it is known that the average weight of this population is exactly 80 kg. Based on the above sample, what would be the proportion of this population that has a weight higher than 86 kg with a confidence level of 95%. Give a confidence interval for this proportion at this confidence level. ( Hint: Find out the confidence interval for the population standard deviation first).
Percentage
A percentage is a number indicated as a fraction of 100. It is a dimensionless number often expressed using the symbol %.
Algebraic Expressions
In mathematics, an algebraic expression consists of constant(s), variable(s), and mathematical operators. It is made up of terms.
Numbers
Numbers are some measures used for counting. They can be compared one with another to know its position in the number line and determine which one is greater or lesser than the other.
Subtraction
Before we begin to understand the subtraction of algebraic expressions, we need to list out a few things that form the basis of algebra.
Addition
Before we begin to understand the addition of algebraic expressions, we need to list out a few things that form the basis of algebra.
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