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2 - Yogesh Uppal
2 - Yogesh Uppal

Jeopardy Review
Jeopardy Review

... A researcher administers the same drug to 3 groups of participants, with each group confined to a room with a different temperature—60, 70, and 80 degrees respectively. What is the independent variable and how many ...
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... us to formulate a CI for a population mean by making it possible for us to use a standard normal percentile z =2 . However, in some cases, we may not be able to obtain a large sample, but may still want to formulate a CI. Because the sample size is small we now have 2 potential problems: 1. We can n ...
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... 9. To determine an appropriate speed limit for a roadway, traffic engineers conduct radar checks of the speeds of passing cars at a selected location and under ideal driving conditions. They then conduct a statistical analysis of the data to determine the safest speed limit to post on the roadway. T ...
1 A certain brand of flood lamps has a lifetime that is normally
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Technical Paper II - Statistics - Bhutan Civil Service Examinations

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... You must be careful about what you say about confidence intervals. Remember that a confidence interval is an ESTIMATE for the UNKNOWN parameter mu, which is the mean score of all students who took the test. We are trying to estimate mu by selecting a sample. Our sample yields an x-bar of 59.2. This ...
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... A factor is a variable that can take one of several levels used to differentiate one group from another. An experiment has a one-way or completely randomized design if several levels of one factor are being studied and the individuals are randomly assigned to its levels. (There is only one way to gr ...
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... Comparing the results of one- and two-tailed t-tests ______________________________________________ Big Bad Lou as a One-Tailed Test You lost a lot of money at the track and were forced to become the personal statistician of notorious underworld crime boss “Big Lou”. Big Lou wants to know if his so ...
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Interval Estimation

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Student's t-test

A t-test is any statistical hypothesis test in which the test statistic follows a Student's t-distribution if the null hypothesis is supported. It can be used to determine if two sets of data are significantly different from each other, and is most commonly applied when the test statistic would follow a normal distribution if the value of a scaling term in the test statistic were known. When the scaling term is unknown and is replaced by an estimate based on the data, the test statistic (under certain conditions) follows a Student's t distribution.
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