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The article "High Levels of Mercury Are Found in Californians" describes a study in which hair samples were tested for mercury. The hair samples were obtained from more than 6000 people who voluntarily sent hair samples to researchers at Greenpeace and The Sierra Club. The researchers found that nearly one-third of those tested had mercury levels that exceeded the concentration thought to be safe.
Is it reasonable to generalize these results to the larger population of U.S. adults?
Yes, the results can be generalized.
No, this generalization is incorrect.
There is no enough data to conclude.
Part variability is critical in the manufacturing of ball bearings. Large variances in the size of the ball bearings cause bearing failure and rapid wearout.
What must be checked in order to compare two population means when you do not know the values of the population standard deviation? Which one?
question a high school counselor wants to examine whether the teenage pregnancy rate at her school is different from
determine if the statement is a typical null hypothesis ho or alternative hypothesis ha. the average time to graduate
A study of cats and dogs found that 11 of 50 cats and 21 of 50 dogs slept more than 10 hours per day. At the .05 level of significance, is there sufficient evidence to conclude that a difference exists between the proportion of cats and the propor..
Suppose a large sample is selected (instead of just 10). About 95 percent of the predictions regarding sales would occur between what two values?
assuming a line of regression of y 2.1 0.8x between temperatures and production yield. if the average temperature is
A test was conducted to determine whether gender of a spokesperson affected the likelihood that consumers would prefer a new product.
A sample of n=9 scores is obtained from a normal population distribution with o-=12. The sample mean is M=60.
what sample size should be used in the funding decision study? Use σ = $4000 as a planning value. ________________
If the server has 40 customers in one shift, what is the probability that her total tips are less than $250? (Assume that these 40 customers represent a simple random sample).
When we say we have confidence level of 95% what do you believe our "margin of error" is?
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