A random sample of 16 pharmacy customers showed the waiting times below (in minutes). 17 18 16 20 20 12 19 19 15 27 14 23 15 25 18 20 Click here for the Excel Data File Find a 90 percent confidence interval for µ, assuming that the sample is from a normal population. (Round your standa answer to 4 decimal places and t-value to 3 decimal places. Round your answers to 3 decimal places.) The 90% confidence interval to
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.
assist with the 90% confidence interval question
we wants to find the 90% confidence interval .
as population parameters are unknown we use t test statistics to build 90 % confidence interval .
let us fist calculate sample mean and sample standard deviation .
| waiting time (x ) | Deviation (X - M) | Squared Dev. |
| 17 | -1.62 | 2.64 |
| 18 | -0.62 | 0.39 |
| 16 | -2.62 | 6.89 |
| 20 | 1.38 | 1.89 |
| 20 | 1.38 | 1.89 |
| 12 | -6.62 | 43.89 |
| 19 | 0.38 | 0.14 |
| 19 | 0.38 | 0.14 |
| 15 | -3.62 | 13.14 |
| 27 | 8.38 | 70.14 |
| 14 | -4.62 | 21.39 |
| 23 | 4.38 | 19.14 |
| 15 | -3.62 | 13.14 |
| 25 | 6.38 | 40.64 |
| 18 | -0.62 | 0.39 |
| 20 | 1.38 | 1.89 |
| 298 | ||
| M: 18.62 | SS: 237.75 |
hence based on above table sample mean = 18.62
and standard deviation=
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