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To study the effect of fluoridated water supplies on tooth decay, two communities of roughly the same socioeconomic status were chosen. One of these communities had fluoridated water while the other did not. Random samples of 200 teenagers from both communities were chosen, and the numbers of cavities they had were determined. The following data resulted.
Cavities
Fluoridated Town
Nonfluoridated Town
0
154
133
1
20
18
2
14
21
3 or more
12
28
Do these data establish, at the 5 percent level of significance, that the number of dental cavities a person has is not independent of whether that person's water supply is fluoridated? What about at the 1 percent level?
A beverage company is trying to ?nd out the distribution of the breaking strength of their glass bottles. Fifty bottles are selected at random and tested for breaking strength, with the following results (in pounds per square inch):
A college's data about incoming freshmen indicates that the mean of their high school GPA was 3.4, with a standard deviation of 0.35. Let X=the GPA of an incoming freshman. The students are randomly assigned to writing groups of size 49.
two cars leave towns 1000 kilometers apart at the same time and travel toward each other. one cars rate is 14
Consider the following results for two samples randomly taken from two populations. Construct a 99 percent confidence interval estimate of the difference between the two sample means.
The quality control manager at a light globe factory needs to estimate the mean life of large shipment of energy-saving compact light globes. The historical standard deviation of light globe life is 250 hours. A random sample of 64 light globes..
A random sample of stipends of teaching assistants in economics is listed below. Is there sufficient evidence at the alpha=.05 level to conclude that the average stipend different from $15,000? The data is listed below:
suppose the u.s. president wants an estimate of the proportion of the population who support his current policy toward
Suppose that 800 jawbreakers are selected at random from the production lines. Would it be unusual for this sample of 800 to contain 406 jawbreakers that weigh more than .4 ounces?
In a regression model with one independent variable X, the intercept or constant (b0) represents the - When an explanatory variable is dropped from a multiple regression model, R2 can increase.
suppose that two dierent tests a and b are to be given to a student chosen at random from a certain population. suppose
below you are given ages that were obtained by taking a random sample of 9 undergraduate students. assume the
Find the minimum sample size needed using a prior study that found that 36% of the respondents said they support abolishing the penny.
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