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Question: Getting teachers to come to school Elementary schools in rural India are usually small, with a single teacher. The teachers often fail to show up for work. Here is an idea for improving attendance: give the teacher a digital camera with a tamperproof time and date stamp and ask a student to take a photo of the teacher and class at the beginning and end of the day. Offer the teacher better pay for good attendance, verified by the photos. Will this work? Researchers obtained permission to use 120 rural schools in Rajasthan for an experiment to find out.
(a) Explain why it would not be a good idea to offer better pay for good attendance to the teachers in all 120 schools and then to compare this year's attendance with last year's.
(b) Describe a completely randomized design for an experiment involving these 120 schools. Write a few sentences describing how you would implement your design.
if tow televisions are randomly selected, compute the probability that both televisions work. what is the probability that at least one does not work?
Compute the value of the sample correlation coefficient between weekly sales and shelf space. Is the correlation between weekly sales and shelf space significant at the .01 level of significance? What is the estimated regression equation?
the weight of a product is normally distributed with a standard deviation of .5 ounces. what should the average weight
Probability of .2, $15 with a probability of .35. How much should the lab budget for next year's rat orders assuming the distribution stays the same.
Depict the situation as a model with incomplete information, where the state of nature is the amounts in Mark and Luke's envelopes.
When rain is forecast, Mr. Pickwick takes his umbrella. When rain is not forecast, he takes it with probability 1/3. Find the probability that Pickwick has no umbrella, given that it rains.
For each of the following two sets of data, explain which one is likely to have a larger standard deviation.
Which of the following sources of error are included in the margin of error? -a different sample would likely produce different numbers -some people whose numbers were chosen never answered the phone in several calls -some people did not answer tr..
How could the number of people who do not know who Martha Stewart is increase from June to July? Did people forget her? Or is the poll perhaps flawed? Explain how these results could be valid.
A large population of metal rods have an average diameter of .943 inches with a standard deviation of .001 inches. The engineering specification for the rods requires that they be between .941 and .944 inches.
Draw a scatter diagram with body weight as the independent variable and wing length as the dependent variable. Find the equation of the line of best fit.
Public Health and Nutrition Many remember actor Michael J. Fox as conservative Republican Alex Keaton on the TV show Family Ties. After more than 10 years.
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