Probability/Proportions
Find p and q for 45%
What is p=.45, q=.55
Formula for IQR
What is Q3-Q1
Find the mean of 68 9 32 11 201 4 57 82
What is 58
Parameter for Central Limit Theorem (CLT)
What is the sample size must reach 30
Run a test; No known SD, sample size is small, normally distributed
What is the t test
p and q if x=103 and n=175
Formula for standard deviation
What is square root of (E (xi-x)^2/(n-1))
Standard deviation of 38, 51, 46, 79, 57
what is s=15.5
Describes the sum of the mass of the unit of probability before and up to a specified value for a discrete random variable X
What is Cumulative Density Function (CDF)
t/α2 value for a 90% confidence interval for the mean when the sample size is 8.
What is 1.895
Variance, X= 5, 6, 7, 8, 9, 10: P(x)=.05, .2, .4, .1, .15, .1
What is 1.8
Expected value formula
What is E X((p(x))
Q1 and Q3 for 18 8 17 33 2 31 20 28 39 46 49
What is Q1=17 and Q3=39
Difference between inferential and descriptive statistics + example
What is one is based on retrospective data and the other is a (less accurate) prediction
2.58million Americans leave their televisions on at night
There is a 40% chance of rain tomorrow
Find 98% CI of the mean. A meteorologist who sampled 4 thunderstorms found that the average speed at which they traveled across a certain state was 13 miles per hour. The standard deviation of the sample was 4.7 miles per hour.
What is 2.33<u<23.67
In a random sample of 210 people, 154 said that they watched educational television. Find the 90% confidence interval of the true proportion of people who watched educational television. Round intermediate answers to at least five decimal places. Round your final answers to at least three decimal places.
What is 68.3% - 78.4%
Formula for confidence intervals
What is x+or- za/2(SD/square root of n)
Outliers of 132, 141, 102, 150, 162, 135, 134
What is 102
Z score (or z value) represents __, used for __
What is the number of standard deviations away from the mean a particular data point is. To determine normality.
Sample size necessary to estimate the true population of homes that have a direct satellite television receiver with 99% confidence and within 2 percentage points
What is 3121 homes
A CBS News/New York Times poll found that 329 out of 763 randomly selected adults said they would travel to outer space in their lifetime, given the chance. Estimate the true proportion of adults who would like to travel to outer space with 93% accuracy.
Formula for proportions
What is p+or-za/2 square root of (pq/n)
Find the data in this set and if there are any outliers
9 12 15 16 18 19 20 22 24 25
What is 18, 18.5, none,
8, 15, 22, 7, no outliers
Meaning of 95% confidence interval of the mean
What is an interval 95% certain to contain the actual mean
A random sample of 40 cars in the drive-thru of a popular fast food restaurant revealed an average bill of $17.96 per car. The population standard deviation is $6.22. Estimate the mean bill for all cars from the drive-thru with 94% confidence. Round intermediate and final answers to two decimal places.
What is $16.11<u<$19.81