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Random sample of 90 eighth grade students' scores on the national mathematics assessment test has mean score of 284 with standard deviation of 35. This test result prompts state school administrator to declare that mean score for state's eighth graders on this exam is more than 280. At mean = 0.14, is there adequate evidence to support administrator's claim.
Determine standardized test statistic z and its corresponding area. If convenient use technology. z=( ) round to two decimals. Area= ( ). round to four decimals.
Determine the P-value. If convenient, use technology. P-value = ( ) round to four decimal places as needed.
Make decision whether to reject or fail to reject null hypothesis. Reject Ho or Fail to reject Ho ( ).
By using this data and incorporating seasonal effects, predict quarterly turnover for 2010.
You just saw an ad on television that states the majority of the population would vote to make smoking illegal. The poll that is referenced shows 53% of those asked supported making smoking illegal.
Use this information to construct a probability table, and then calculate each of the following probabilities:
Prepare the confidence interval of 95% for the welders' proportion that graduated in the school of welding.
Base on a survey of over 10,000 households, the number of televisions in the home was recorded as given in the table below. Based on the data, find the expected number of televisions in a home.
What is the likelihood the sample mean is greater than $22.50 but less than $25.00?
Letting μ be the mean composite satisfaction rating for the gaming console, we find that the test should be H o : μ ≤ 42 versus H a : μ > 42
Rank the funds by using this alternative measure of risk. Which, if any outperformed the market on the risk-adjusted basis.
Given the following data, calculate the EMV for each investment alternative. Which is best based on the EMVs you calculated?
A random sampling of financial analysts was asked to provide forecasts of earnings per share of a corporation's stock for the next year. The results are summarized as follows:
The percentage 'y' of impurities per batch in a certain chemical product is a beta random variable with probability density
A company ships computer components in boxes that contain 20 iteams. Assume the probability of a defective component is .4. use the geometric distribution to find the probability that the first defect is found in the third or fourth component test..
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