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The t distribution, compared to the z distribution, is

I conduct a statistical test of hypotheses and find that the null hypothesis was rejected at level α = 0.05.  Based on this information, which of the following is necessarily true?

Which of the following conditions is a the anterior slippage of the superior vertebra on the inferior vertebra?

Suppose that a difference between two groups is examined. In the language of statistics, the alternative hypothesis is a statement that there is

When testing for the significance of the difference between two samples, which is the proper assumption?

Match the following angles of inclination of the femoral neck to the appropriate terminology.

You are interested in testing the difference between pre-incarceration and post-release average number of arrests for a sample of prisoners. You are assuming a normal distribution. You believe that post incarceration arrests will be lower than pre-sanction arrests. Test using alpha =0.05 Use the following Excel data Note: Only one table is the correct test t-Test: Two-Sample Assuming Equal Variances   Pre-sanction Post-release Mean 8.3 7.4 Variance 16.6777778 6.711111 Observations 10 10 Pooled Variance 11.6944444 Hypothesized Mean Difference 0 df 18 t Stat 0.58848814 P(T

You have decided to analyze a set of data with a 2 sample t-test for independent groups.  What thumb rule do you use to determine if you should assume equal or unequal variances?

Which hypothesis test should you perform for the following scenario? You survey a sample of 100 students from Partytime High School and 100 students from Funtime High School, and find that those from Partytime High school have smoked marijuana 2.1 times (s=0.6) in the last month, while those at Funtime High School have smoked marijuana an average of 1.5 times (s=0.5).  

When testing a single sample mean for significance when the population standard deviation is unknown and sample size is 75, the correct sampling distribution is