Confidence Intervals
What is the sample proportion: (as a decimal) 14 out of 20 NH kids surveyed think there are sharks in Lake Winnipesaukee.
What is 0.7?
Represents the probability of observing data as extreme as or more extreme than what was observed, assuming the null hypothesis is true.
What is a p-value?
Formula for SE in a hypothesis test for a single mean.
What is s/sqrt(n)?
The point estimate for a confidence interval for a difference of proportions.
What is p^1 - p^2?
b_1 in the equation: hat_y = b_0 + b_1x.
What is the slope?
Formula/short description of finding a sample mean.
What is sum all data and divide by the number of entries?
Claim: The mean is less than 75.
Would this be a statement of the null or alternative hypothesis?
What is an alternative hypothesis?
A company claims that the mean salary is $60,000. You sample 35 employees and find a mean salary of $61,200 with a standard deviation of $2000. Write the null and alternative for this.
What is: H_0: mu = 60000 and H_a: mu does not equal 60,000?
What is 1.75?
R = -1
What is the strongest negative linear relationship between two numerical variables?
Z score for 90% CI.
What is 1.65?
If the level of significance is 0.05 and the p-value is 0.0032,this is your decision.
What is reject the null hypothesis?
Number that answers the following: "Assume that we surveyed 200 people and asked them their shoe size and found a sample mean of 9 with a sample standard deviation of 0.5. Assume that the "claimed" mean for shoe size is 9.5. What is the T-score of our sample mean?"
What is -14.14?
If the confidence interval for the difference in proportions includes zero, this is what it suggest about the two proportions.
What is that: it suggests that there is no statistically significant difference between the proportions of the two groups?
Given that the point (101780, 19940) is on the line and the slope estimate b_1 = -0.0431, this is the value of b_0.
What is 24,327?
T score when given 99% confidence and sample size of 20
What is 2.86?
If we are hypothesis testing for the proportion, this is the distribution that we can use.
What is the normal distribution?
A magazine claims that more than 70% of it's readership are registered as democrats. You randomly sample 100 readers and find the 68 are registered democrats. This is the p-value.
What is 0.67?
Researchers conducted an experiment in which people with a certain condition were given either a drug or a placebo. At the end of the experiment, they will measure the proportion with improved symptoms. They suspect that the drug will be more effective than the placebo. These are the null and alternative hypotheses.
What is H_0: p_d = p_p and H_a: p_d > p_p?
Suppose that we are given the following regression line predicting financial aid based on family income: hat_y =24327 - 0.0431x. Please provide an interpretation of the intercept.
What is "the average financial aid if a family has no income is $24,327"?
Construct a 95% confidence interval for p, the proportion of NY adults who supported a quarantine for anyone who has come into contact with an Ebola patient. Let SE = 0.012 and hat_p = 0.82. Round to three decimals.
What is (0.796, 0.844)?
These are the assumptions that must be checked before performing a hypothesis test for the proportion.
What is np (claimed p) >= 10, n(1-p) (claimed p) >= 10, and independence of observations?
A company claims that the mean salary is $60,000. You sample 35 employees and find a mean salary of $61,200 with a standard deviation of $2000. Conduct a hypothesis test. This is the conclusion when we let our significance level equal 0.05?
What is reject the null hypothesis?
Your two sample proportions are 43/67 and 32/55. Find p_pooled.
What is 75/122 (0.61)?
Suppose that we are given the following regression line predicting price based on whether a video game is new or used: hat_price = 42.87 + 10.90*cond_new where cond_new = 0 if the game is used and cond_new = 1 if the game is new. Interpret the slope of this line.
On average, new games sell for about $10.90 more than used games.