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1. A study to compare two types of infant formula was run at two sites, one in Atlanta and the second in Denver. The study was run over a three-week period. Subjects at both sites were classified as dropouts if they left the study before the conclusion, or completers if they finished the study. The following table gives the number of dropouts and completers at each site. A chi-square test was performed and the result was X2 = 5.101 with P-value = 0.024.
The correct conclusion is
A. Atlanta had a greater dropout rate.B. Denver had a greater dropout rate.C. any differences can be explained by sampling variability.
2. A study was performed to examine the personal goals of children in grades 4, 5, and 6. A random sample of students was selected for each of the grades from schools in Georgia. The students received a questionnaire regarding personal goals. They were asked what they would most like to do at school: make good grades, be popular, or be good at sports. Results are presented in the table below by the sex of the child.
This is aA. 2 × 2 table.B. 2 × 3 table.C. 3 × 2 table.
Construct a relative frequency distribution for the weights of regular Coke by starting the first class at 0.7900 lb. and use a class width of 0.0050 lb.
How can you can discriminate between data that can be analyzed with the chi square and data that can be analyzed with the ANOVA?
Two components of reliability 0.95 are in parallel and this subsystem is connected in series to a component with a reliability of 0.90. Calculate the overall reliability of this system.
The inventory value is estimated by the sum of book values of population and N-D, where N is population size at top ,D at bottom. show that the estimate is unbiased. Find an expression for the variance of the estimate.
The average time it took then to change a water pump was 18 minutes. The standard deviation of the sample was 3 minutes. Find the 99% confidence interval of the true mean.
How close is the calculated value to your experimental value?
Create a 95% confidence interval for proportion of highly educated women who left careers for family reasons and who wish to return to work.
A normal distribution with a mean of 60,000 miles and a standard deviation of 5,200 miles. What percent of the tires will last at least 75,000 miles?
Does age make a difference in the amount of savings a worker feels is needed to be secure at retirement? Suppose 210 workers in the 25-33 age category and 176 workers in the 34-52 age category were involved in this study.
Perform the five-step hypothesis test on the data. - LORA - this is the portion I am responsible for based on using the nonparametric hypothesis testing.
A device has a sensor connected to an alarming system. The sensor triggers with probability 0.95 if dangerous conditions exist in a given day and with probability 0.005 if conditions are normal during the day. Days with dangerous conditions occur ..
What is the probability that the person guessing the numbers guesses it incorrectly between 8 and 20 times out of the 34 times the game is played?
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