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Math
Statistics
Hypothesis Testing
Stats test 3
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Terms in this set (12)
We have a single sample and want to know if it differs from a test value, usually an estimated population mean
one sample t test
we can guess mean but dont know sigma
one sample t test
We want to determine if two samples differ significantly from one another or not (are they from the same population or different populations in the real world?)
two sample t test
dependent samples (repeated measures) is like the one sample t test but based on ___________
difference scores
independent sample tests uses the __________ to estimate the standard error for the sampling distribution
pooled variance
steps of hypothesis testing
state hypothesis, determine critical values, calculate statistics, make a decision and conclusion
________ hypothesis is our assumed hypothesis that the alternate is untrue
null
_______ hypothesis is your research hypothesis
alternate
A _________ is a guess for u based on the point in the sample
point estimate
a ______________ is a range that we are k% sure that u is within, where k is a percentage
interval estimate
confidence intervals get _______ the higher the level of confidence that is desired
larger
confidence intervals get ________ the larger the sample size
smaller
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Verified questions
PROBABILITY
A bag contains balls that are either red or blue and either dull or shiny. What is the sample space when a ball is chosen from the bag?
STATISTICS
Classify the two samples as independent or dependent. Explain your reasoning. Sample 1: The average speed of 23 powerboats using an old hull design Sample 2: The average speed of 14 powerboats using a new hull design
STATISTICS
Determine whether the random variable x is discrete or continuous. Explain your reasoning. (a) Let x represent the number of lightning strikes that occur in Wyoming during the month of June. (b) Let x represent the amount of fuel (in gallons) used by a jet during takeoff. (c) Let x represent the total number of die rolls required for an individual to roll a five.
STATISTICS
Find the critical value(s) and rejection region(s) for the type of t-test with level of significance $$ \alpha $$ and sample size n. Two-tailed test, $$ \alpha = 0.05, n = 20 $$