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Q1) From random sample of 1201 Americans, it was discovered that 62 of them lived in neighbourhoods with improper levels of carbon monoxide.
i) Determine the point estimate? Give the symbol and value.
ii) Create a 99% confidence interval for proportion of all Americans who live in a neighbourhood with improper levels of carbon monoxide
iii) What sample size would be required for estimate to be within 1.5 percentage points with 99% confidence if you used estimate of that was earlier obtained.
iv) If you wanted your confidence level to be 95%, would your sample size be larger or smaller?
Use the trend equation to calculate the points for 2003 and 2005. Plot them on the graph and draw the regression line.
In a distribution of scores, the arithmetic mean is 51, the median is 55, and the mode is 62. What is the score, in percentile form, of a subject who does less well than two-thirds of the sample?
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location. Research question: At α = . 05, does vehicle type vary by mall location?
If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
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Calculate the mean number and median number of apples in a bag.
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A manufacturer of billiard balls is testing three additives to the basic plastic. Show the partial ANOVA table
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