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There are a total of 160 practicing physician in a city. Of them 75 are female and 25 are pediatricians of the 75 females, 20 are pediatricians are these events female and pediatrician independent?
Is this sufficient evidence, at a significance level of 5%, to allow us to conclude that the candidate's popularity has decreased? State any assumptions that need to be made.
Using the data in the table above, and assuming a significance level of 10%, conduct a test to determine whether the level of job satisfaction depends on the supervisor-employee gender relationship
Using a significance level of 10%, test the hypothesis that dividend payout ratios are normally distributed. (HINT: Combine the three highest classes, since the expected frequencies of the two high
Using a four-quarter centred moving average, measure the quarterly variation by calculating the seasonal (quarterly) indexes. Use these to obtain the seasonally adjusted earnings for each of the 16
JenCo tracks their daily profits and has found that the distribution of profits is approximately normal with a mean of $20,700.00 and a standard deviation of about $750.00. Compute the probability t
A population consists of 45 items, 35 of which are defective. In a sample of 4 items, what is the probability that exactly 3 are defective?
Police records show that there has been an average of 2 accidents per week on a new freeway. Calculate the probabilities if these accidents follow a Poisson process.
A sample of 97 observations indicated that X1 is 87. A second sample of 153 observations indicated that X2 is 117. Conduct a z-test of hypothesis using a 0.02 significance level.
A sample of 51 observations has a mean of 98 and a standard deviation of 7. A second sample of 69 observations has a mean of 95 and a standard deviation of 8. Conduct a z-test of hypothesis using a
Fill in the missing calculations needed for the expected frequencies and Chi-Square. For full marks your answer should be accurate to at least two decimal places.
Use the regression line above to estimate the net earnings for a company with sales of $62.4 thousand. For full marks, estimate your answer to the nearest dollar.
Using your favorite statistical computing tools, find the coefficient of correlation for the data. For hill marks your answer should be accurate to at least three decimal places.
Round your computed test statistic to two decimal places and find the P-value. For full marks your answer should be accurate to at least four decimal places.
a. Develop a payoff table. b. What decision should be made if the expected value criterion is used?
What decision would you recommend? (Hint: Set up a payoff table, and remember that you want to minimize costs ) What is the expected value of perfect information?
Of course, if the law is passed and the decision is to bottle the cola in nonreturnable bottles, all profits would be from out-of-province sales. Compute the expected profit for both bottling decis
Of course, if the law is passed and the decision is to bottle the cola in nonreturnable bottles, all profits would be from out-of-province sales. Compute the expected profit for both bottling decisi
Using only the information given above how large a sample is required? Each of your answers should be rounded up to a whole number.
A population standard deviation is estimated to be 13. We want to estimate the population mean within 1.7, with a 90-percent level of confidence. What sample size is required?
Develop an approximate 99-percent confidence interval estimate for the mean number of memorabilia purchased per person.
It was found that the sample mean was 15.00 cm and the sample standard deviation was 2.42 cm. Given this information, develop a 95.0% confidence interval estimate for the population mean (assuming t
Obtain a point estimate of the proportion of defectives in population. For full marks your answer should be accurate to at least three decimal places.
Given below is the formula for computing the confidence interval. Fill in the missing values. For full marks your answer should be accurate to at least two decimal places.
"Statistics helps us make decisions based on data analysis." Briefly discuss how the news item or article meets this objective. Cite your references.