STA 261 Final Miami University Latest Update

STA 261 Final Miami University Latest Update - with 235 Questions and 100% Verified Detailed Correct Answers Guaranteed A+ Approved by Professor

1 Mean t-interval Assumptions - CORRECT ANSWER: Randomly obtained

Normal DIstribution

1 Proportion Plus 4 z-interval Assumptions - CORRECT ANSWER: Randomly obtained

Not enough samples: np<15, n(1-p)<15

2 Proportions z-test/z-interval Assumptions - CORRECT ANSWER: Randomly obtained

Categorical At Least 10 Successes and Failures

• types of probability - CORRECT ANSWER: Subjective (personal probability), empirical

(formulas), Experimental (results of a random experiment)

Alternate hypothesis - CORRECT ANSWER: to determine whether a population

proportion is different from a specified value (two-tailed) determine whether the proportion is less than the value (left-tailed) determine whether the proportion is more than a specified value (right-tailed)

Association - CORRECT ANSWER: describe the relationship between the two variables positive, negative, none

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Bar graph - CORRECT ANSWER: frequency of the x-axis value is related to height of the bar bars don't touch

Binomial Distribution - CORRECT ANSWER: fixed number of trials

• possible outcomes

Probability of success is the same each trial independent

Blocking - CORRECT ANSWER: used in experiments- group similar experimental units together

Bootstrap - CORRECT ANSWER: resample with replacement from the sample

distribution (bootstrap sample) Resample a lot of sets of observations from the original sample distribution Create distribution of point estimates from the samples (bootstrap distribution)

case control study - CORRECT ANSWER: subjects who have response outcome of

interest is case, subjects with other outcome is control

Categorical Data Charts - CORRECT ANSWER: Pie chart, bar graph, pareto chart

Categorical variable - CORRECT ANSWER: non-numerical variable with different

categories

Center of distributions - CORRECT ANSWER: Mean- symmetric

Median- skewed

CLT Assumptions - CORRECT ANSWER: Randomly obtained

10% of the population or less 2 / 3

Independent At least 15 successes and failures

Cluster random sampling - CORRECT ANSWER: split population in representative

groups called clusters use random sampling to pick a few clusters perform a census on those

Coefficient of determination, r^2 - CORRECT ANSWER: determines the percentage of variation in the observed values of the response variable that is explained by the regression line

Complement of an event - CORRECT ANSWER: the event doesn't occur

Conditional Probability - CORRECT ANSWER: P(A|B) = P(A&B)/ P(B)

probability that A will occur if B already occured

Confidence interval - CORRECT ANSWER: point estimate and adding/subtracting the

margin of error

Confidence Interval for 1 Population Proportion Assumptions - CORRECT ANSWER:

Randomly Obtained np>15, n(1-p)>15

Confidence interval for the slope of a regression line - CORRECT ANSWER: slope of a line represents the change in the response variable resulting from an increase in the explanatory variable by 1 unit

Confidence Intervals for Beta Parameters - CORRECT ANSWER: contains zero,

explanatory may have no effect on the response

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