Assume the variable is normally distributed. Source: Based on information from Consumer Protection Safety Commission. 7. Pacemaker Batteries A manufacturer of pacemakers wants the standard deviation of the lifetimes of the bat- teries to be less than 1.8 months. A sample of 20 batteries had a standard deviation of 1.6 months. Assume the vari- able is normally distributed. Find the 95% confidence interval of the standard deviation of the batteries. Based on this answer, do you feel that 1.8 months is a reason- able estimate? 8. Age of College Students Find the 90% confidence interval for the variance and standard deviation of the ages of seniors at Oak Park College if a random sample

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Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.