ts Please complete the following multiple choice quiz over t-test concepts. This

Question

ts Please complete the following multiple choice quiz over t-test concepts. This is an open book quiz. You have 30 minutes to complete this quiz D Question 1 Tim 1 pts 29 1 How does the shape of the t-distribution change as the sample size increases? O It becomes broader. It becomes skewed. 0 It becomes flatter. It becomes more normal looking. arch D Question 2 1 pts My friend, Bob, believes that his supermarket's prices are lower than mine. We construct a list of identical items and purchase them at our respective stores every week for two months. Then Bob wants to know if his hypothesis is supported. dia Bob has a directional hypothesis and should do a matched t-test. O Bob has a non-directional hypothesis and should do an independent t-test. O Bob has a directional hypothesis and should do an independent t test O Bob has a non-directional hypothesis and should do a one sample t-best demic Sup- ost) D Question 3 1 pts upple- If I want to compare the performance of a particular group to an established, accepted average but information about the population standard deviation is not available. I should tions conclude this cannot be done conduct * one-sample t-test. conduct a one-sample z best conduct a cormelated t-test O

Explanation / Answer

in question 1 ) the probability curve is symmetric about 0 and bell shaped . hence we get mean = mode = median = 0.

for large n the curve will resemble to that standard normal curve . hence the option 4 ) is correct answer . it become more normal looking.

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