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A study in El Paso, Texas, looked at seat belt use by drivers. Drivers were observed at randomly chosen convenience stores. After they left their cars, they were invited to answer questions that included questions about seat belt use. In all, 75% said they always used seat belts, yet only 61.5% were wearing seat belts when they pulled into the store parking lots.
Select the correct explanation of the reason for the bias observed in responses to the survey.
The drivers were not selected at random.
The drivers were biased towards using seat belts.
The drivers showed a response bias since they may report they always use seatbelts even if they do not.
The sample population is more affluent than the average since they all have cars.
Give an example of a single polynomial with degree 3, whose value is 4 when the variable is equal to 1. Give an example of a single polynomial with degree 3, whose value is 29 when the variable is equal to 2.
the probability density function of the net weight in ounces of a packaged compound is fx x40 for 19ltxlt21 ounces and
If we take a random sample of 12 individuals from this population, what is the probability that four of them have blue eyes?
Create a 95% confidence interval for the difference in the proportions of senior men and women who have this disease.
The mean serum cholesterol level of 25 men ages 65-74 is 231, with a sample standard deviation of 50. For 25 women of the same age, the mean serum cholesterol level is 255 with a standard deviation of 49. Are the average serum cholesterol levels stat..
A GSS asked. "What do you think is the ideal number of children for a family to have? the 497 female who responded had a median of 2, mean of 3.02 and standard deviation of 1.81 (a) Report the point estimate of the population mean.
In the Probability applet, set the probability of heads to 0.25. Explore what happens for different numbers of tosses. Summarize what you have learned.
the article evaluation of criteria for setting speed limits on gravel roads measured speeds of vehicles on several
Does natural phenomena like hemoglobin levels or the weight of ants follow a normal distribution.
A survey of 500 non-fatal accidents showed that 226 involved the use of a cell phone. Construct a 99% confidence interval for the proportion of fatal accidents that involved the use of a cell phone.
Because of the difficulty of weighing a bear in the woods, researchers caught and measured 54 bears, recording their weight, neck size, length, and sex. They hoped to find a way to estimate weight from the other, more easily determined quantities.
The moment generating function for a random variable X is MX(t) = (1 - at) -k. Find the mean and variance of X.
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