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What are some of the concerns relating to the internal validity of a study and recommendations to strengthen it? How will the other 3 types of validity help? What are the dangers of failing to consider the validity of a research study?
An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects ten schools from the district and interviews all of the teachers at the selected schools.
Assume duration of human pregnancies follow mound-shaped distribution with mean of 266 days and the standard deviation of 16 days.
the distribution of heights of adult males is normally distributed with mean 68 inches and standard deviation 2.9
Also, Y1 Y2, . . . , Yn , representing yields for corn variety B, constitute a random sample from a normal distribution with mean μ2 and variance σ2. If the X's and Y 's are independent, find the MLE for the common variance σ2. Assume that μ1 and ..
Make a List of type of possible errors. Assume that you were interested in knowing the mean score for a certain quiz in a statistics class.
In the U.S., there are two sources of national statistics on crime rates: (i) the FBI's Uniform Crime Reporting Program, which publishes summaries on all crimes reported to police agencies in jurisdictions covering virtually 100% or the population..
Study is conducted as to whether there is relationship between joggers and consumption of nutritional supplements.
Compute and compare the proportions of positive cases for the two exposure levels. What would be your conclusion? Calculate the odds ratio associated with high exposure. Does this result support your conclusion in part (a)?
a particular consumer product is being assembled on production lines ab and c and packaged in batches of 10. each day
(a) Find the mean, variance, and range for these data and interpret. (b) Find lower and upper quartiles, median, and interquartile range. Check for any outliers. (c) Construct a box plot and interpret.
Generate a 95% confidence interval for the true mean total cholesterol levels in children.
He notices that 21 of the throws come up 7. State the null and alternative hypothesis, and find the P-value of his observations.
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