Types of Samples
The name of the groups within a stratified sample.
What is a strata?
Probability is between __ and ___
What is 0 and 1?
A way of estimating the true population mean.
What is a confidence interval?
What is parameter is for populations and statistic is for samples?
What is random, 10% condition and normal?
A sample made up of people who are easy to reach.
What is a convenience sample?
A measure of probability of an event given that another event has already occurred.
What is conditional probability?
The estimated standard deviation of a statistic
What is standard error?
The difference between z and t.
Uses data to summarize evidence about a hypothesis by comparing sample estimates of parameters to values predicted by the hypothesis
What is a significance test?
A sample made up of people who self-select into the survey
What is a voluntary sample?
If two events are ________ _______, the probability of them both occurring at the same time is 0.
What is mutually exclusive?
What is true?
What is the meaning of SOCS?
What is shape, outliers, center, spread?
The 2 sample test used when you do not know the standard deviation
What is a t test?
Each group is assigned to one group (and only one group)
What is cluster sampling?
This is the only thing that changes when you add/subtract a constant
What is center?
Which of the following statements is true. I. The standard error is computed solely from sample attributes. II. The standard deviation is computed solely from sample attributes. III. The standard error is a measure of central tendency. (A) I only (B) II only (C) III only (D) All of the above. (E) None of the above.
What is A?
A method of finding the best model for a linear relationship between the explanatory and response variable.
What is linear regression?
The amount of a certain trace element in blood is known to vary with a standard deviation of 14.1 ppm (parts per million) for male blood donors and 9.5 ppm for female donors. Random samples of 75 male and 50 female donors yield concentration means of 28 and 33 ppm, respectively. What is the likelihood that the population means of concentrations of the element are the same for men and women? Is this a one tailed or two tailed test? Write the Hypothesis and Alternative Hypothesis.
What is Two Tailed H0: μ1 = μ2 or H0: μ1 – μ2 = 0 Ha: μ1 − μ2 or: Ha: μ1 − μ2 ≠ 0?
The differences between a stratified sample and a randomized block design.
What is strata vs. block OR random vs. not random
This is the only thing that stays the same when you multiply/divide by a constant.
What is shape?
Suppose we want to estimate the average weight of an adult male in Dekalb County, Georgia. We draw a random sample of 1,000 men from a population of 1,000,000 men and weigh them. We find that the average man in our sample weighs 180 pounds, and the standard deviation of the sample is 30 pounds. What is the 95% confidence interval. (A) 180 + 1.86 (B) 180 + 3.0 (C) 180 + 5.88 (D) 180 + 30 (E) None of the above
What is A?
The p-value of a chi-square test is (0.0003). Write a conclusion using this p-value at the .05 significance level.
What is: Since the P-value (0.0003) is less than the significance level (0.05), we cannot accept the null hypothesis. Thus, we conclude that there is a relationship between gender and voting preference?
A herd of 1,500 steers was fed a special high-protein grain for a month. A random sample of 29 were weighed and had gained an average of 6.7 pounds. If the standard deviation of weight gain for the entire herd is 7.1, what is the likelihood that the average weight gain per steer for the month was at least 5 pounds? Is this a one tailed test or two tailed? Write the Hypothesis and Alternative Hypothesis
What is One Tailed H0:μ < 5 H0:μ ≥ 5?