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You work for the BC Lottery Corp. Your boss asks you for an estimate of the percent of British Columbians who have gambled in a BC casino at least once. You decide to take a sample large enough so that the margin of error is no larger than 6% with 95% confidence. Before you take the sample you have no idea what percent have gambled in a BC casino. The results of your sample indicate that 80% have gambled in a BC casino at least once. Your boss tells you the margin of error is too large and wants it reduced to 3%. How many additional adults would you need in your sample to reduce the error to 3%?
Carry out F test for significance of straight line regression of Y on X and interpret your results.
Consider a random sample of size n from a normal distribution, Xi ~ N(m,9). a) Find the CRLB for the variances of unbiased estimators of m. b) Is the MLE, m(hat) = X(bar), a UMVUE of m?
NBC TV news, in a segment on the price of gasoline, reported last evening that the mean price nationwide is $1.50 per gallon for self-serve regular unleaded.
Random Sample: Before you begin your analysis you are required to take a random sample of size 110 from the 170 cases in the file. Use the file Random_Sample_Generator-13-2.xls to do this.
A sample of 81 business managers on the West Coast had an average breakfast cost of $7.65. 13. At a = 0.05, what is the test value?
Find the probability that among 8 randomly selected graduates, at least one finds a job in his or her chosen field within a year of graduating.
There are 40 English students enrolled. The teacher questioned 5 students who always sit in the back of the classroom. Three of the 5 said "yes" when asked if they would like "A Tale of Two Cities" as the next class reading assignment.
Which of the given properties doesn't apply to theoretical normal distribution?
The following data show the cost of electricity during August 2010 for a random sample of 50 one-bedroom apartments in a large city:
Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlation. Use a significance level of 0.05.
What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and the girls?
Using the sample information given in the above exercise, the p value for testing Ho versus Ha can be calculated to be 0.0057
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