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In 2004, Newsmonth reported that 60% of young children have blood lead levels that could impair their neurological development. Assuming that a class in a school is a random sample from the population of all children at risk, the probability that at least 5 children out of 10 in a sample taken from a school may have a blood level that may impair development is:
about 0.786about 0.834about 0.166about 0.812
A sample of approx 25 students enrolled in the university points out that X (bar) = $315.4 and s = $43.20.
Regression - What factors predict duration of dyspnea in elders with heart failure?
Given this information, what would sampling error be if sample including seven values in top row were used to calculate sample mean?
Construct a 90% confidence interval for the population proportion p . Does your result agree with your conclusion in part (a)?
The average price of a home is reported to be $203,190. Use this price as the population mean, and assume the population standard deviation is 43,890.
The overall average for the samples is 17 ounces. The range is only 0.5 ounce. Determine the upper and lower control-chart limits for averages for the boxes of cereal.
A random sample of 100 observations is obtained from a normally distributed population with a standard deviation of 10. What is a 95% confidence interval for the mean of the population if the sample mean is 40?
At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations.
Using Binomial approximation, find the proportion of the days that will be rejected.
Find the regression equation and percentage of variance and test whether the equation is significant portion of the variance.
Demand for a popular athletic shoe is nearly constant at 800 pairs per week for a regional division of a national retailer. The cost per pair is $54.
How would you interpret the findings of a correlation study that reported a linear correlation coefficient of -1.34? a) strong linear correlation b) weak linear correlation c) impossible, d) calculation error no linear correlation
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