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A Researcher randomly chose 12 women and 12 men from the street and gave them a memory test. He found the difference between means of test scores between men and women was 5 and the standard error of the difference in means was 1.0. What's the t-value testing for the null hypothesis that men and women have the same test scores?
1. if x is normally distributed with a mean of 70 and a standard deviation of 7 finda. px less than or equal to 76b.
If after one year, the annual mileage of privately owned cars is normally distributed with mean 14,000 miles and standard deviation 3,500, what is the probability that a car has mileage greater than 20,000 miles?
During the 1890s, what did organizations such as the Sons of Confederate Veterans want to teach a new generation of white southerners?
The monthly sales demand for a new product is uncertain, but it is considered to be adequately described by a normal random variable with mean 50,000 units and variance 100,000,000.
Using a 0.01 significance level, you need to test the claim that this sample comes from a population with a mean zinc level that is significantly
Do all three prototypes have the same average range? Construct an ANOVA table, and carry out the test. Explain your results.
A random sample of students is selected, and each one is asked to try first brand A and then brand B, or vice versa with the order determined at random.
Compare the old schedule that includes overtime on weekends for the regular workers to the new schedule. How much is the company saving?
If we take a sample of seniors from a particular private high school, can we say that sample proportion with no siblings has mean 0.05?
1. what are the assumptions of the simple linear model?2. name three assumptions of the anova
To test the hypothesis that the median weight of 16-year-old females from Los Angeles is at least 110 pounds, a random sample of 200 such females was chosen. If 120 females weighed less than 110 pounds, does this discredit the hypothesis? U..
Many colleges and universities develop regression models for predicting the GPA of incoming freshmen. This predicted GPA can then be used to make admission decisions. Although most models use many independent variables to predict GPA, we will illu..
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