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1. A sample of 65 observations is selected from one population. The sample mean is 2.67 and the sample standard deviation is .75. A sample of 50 observations is selected from a second population. The sample mean is 2.59 and the sample standard deviation is .66. Conduct the following test using 95% level of confidence. Z-test for Unpaired data a. Is it a 1 or 2 tail test b. Compute the statistical calculation c. What is your decision regarding H1 d. What is the P-value
2. The Gibbs Baby Food Company wishes to compare the weight gain of infants using their brand versus their competitor's brand. A sample of 40 babies using the Gibbs products revealed a mean weight gain of 7.6 pounds in the first 3 months after birth. The standard deviation of this sample is 2.3 pounds. A sample of 55 babies using the competitors brand revealed a mean increase of 8.8 pounds with a standard deviation of 2.9 pounds. At 95% level of confidence, can we conclude that the babies using the Gibbs product gained LESS weight? Z-test for Unpaired data
3. What key words tell you that the Hypothesis is to be set up as a 1 Tail UPPER?
normally distributed with a population mean of 2.5 and a population standard deviation of .5. Compute the following, showing all work: The percentage of students with GPA's above 3.0 is?
test the claim that the mean gpa of night students is smaller than the mean gpa of day students at the .05 significance
Can people really identify their favorite brand of cola? Volunteer tasted coca-cola classic, pepsi, Diet coke, and Diet pepsi, with the results shown below.
Determine the special property of standard normal distribution, compared to other normal distributions?
As a construction engineer for a city, you are responsible for ensuring that the company that is providing gravel for a new road puts as much gravel in each truckload as they claim to.
Suppose that people's heights (in centimeters) are normally distributed, with a mean of 165 and a standard deviation of 6. We find the heights of 40 people.
A sample of 16 batteries reveals a mean of 3.45 years and a standard deviation of 0.3 years. Find a 95% confidence interval for the population mean.
When was the first ancient Greek Olympic game held?
mean of peak expiratory flow for children without asthma is 306. investigator wants to see whether children with
Evaluate the regression assumptions of linearity and homoscedasticity by assessing your new residual plot. Be specific about your evaluation
suppose that two evenly matched teams say team a and team b each with probability .5 of winning any given game make it
1. Obtain the test-statistic and p-value. Report the test-statistic with degrees of freedom and the p-value here. 2. Report and interpret a 95% confidence interval for the difference in the mean time to complete the maze between those in the presen..
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