A pharmaceutical company has developed a new drug that they believe could improve students' performance on a statistics exam. To test the drug’s effects, they randomly select 30 students, give half of them a control substance (group 1), and give the other half the drug (group 2). Both groups take the statistics exam, and the graph below portrays the resulting group mean scores. Remember they are expecting an improvement in the experimental group. The drug company sets their significance level (alpha) to .05 for the hypothesis test between the two groups (group 1 = no drug/Control; and group 2 = drug/Experimental). graph This hypothesis test requires a(n) a. Single sample Z test b. Repeated Measures t-test c. Independent sample t-test d. Single sample t test
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
A pharmaceutical company has developed a new drug that they believe could improve students' performance on a statistics exam. To test the drug’s effects, they randomly select 30 students, give half of them a control substance (group 1), and give the other half the drug (group 2). Both groups take the statistics exam, and the graph below portrays the resulting group mean scores. Remember they are expecting an improvement in the experimental group. The drug company sets their significance level (alpha) to .05 for the hypothesis test between the two groups (group 1 = no drug/Control; and group 2 = drug/Experimental). graph This hypothesis test requires a(n) a. Single sample Z test b. Repeated Measures t-test c. Independent sample t-test d. Single sample t test
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