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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?
consider the situation in a cohort study where the crude risk ratio is 2.5 stratum 1 odds ratio is 1 and stratum 2 odds
an average computer mouse inspector can inspect 45 mice per hour. the 42 computer mice inspectors at a particular
Normally distributed with a=2.6inches, answer the following questions. What is the percentile rank of a 20 to 29 year old female who is 60 inches tall?
a textile manufacturing process finds that on average 3 flaws occur per every 180 yards of material produced.a. what is
A histogram of time spent eating & drinking each day is skewed right. Use this result to explain why a large sample size is needed to construct a confidence interval for the mean time spent eating & drinking each day.
a test has a mean of 104 and a standard deviation of 16. we want to be 98 certain that we are within 4 points of the
in the united states the average weight of an adult male is 172 pounds with a standard deviation of 29 pounds. assuming
question suppose that 11 individuals take the gmat graduate management admission test then take a gmat preparation
Using div-terms, implement the procedure remainder-terms and use this to define gcd-terms as above. Now write a procedure gcd-poly that computes the polynomial GCD of two polys.
1. Allen Machines specializes in developing weed-harvesting equipment that is used to clear small lakes of weeds. Allen Machines is contemplating the construction of a machine that would harvest weeds on narrow rivers and waterways. The activ..
consider a small self-service car wash that has cars arriving with exponentially distributed inter arrival times at a
A company is interested in estimating μ, mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee.
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