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An accounting firm is planning for the next tax preparation season. From last year's returns, the firm collects a systematic random sample of 100 filings. The 100 filings showed an average preparation time of 90 minutes with a standard deviation of 140 minutes. What is the standard error of the mean?
a.14 minutesb. 140 minutesc. 1.4 minutesd. 90 minutes
30 in Canada, and 6 in the United State. At level of significance 0.05, test whether the distribution of sales has changed from last year.
a) 95% of confidence intervals generated will include the sample mean X. b) 5% of the confidence intervals generated will include the true mean μ
In 280 trials with a professional touch therapist, correct responses to a question were obtained 1223 times. The P-value of 0.979 is obtained when testing the claim that p > 0.5 (the proportion of correct responses is greater than the proportion o..
Is there enough evidence to reject the claim that the average cost of a home in both locations is the same? Use α = 0.01. Clearly mark each of the five steps in hypothesis testing.
You obtain the data shown below for 30 girls with anorexia who were treated with psychodynamic therapy. Using the data below and the data above compare the outcomes for CBT and psychodynamic therapy.
Bbut only 1 percent of those closed will have something stolen. If a garage is robbed, what is the probability the doors were left open?
A study of 200 commercial firms revealed the data below. What is the probability that a particular firm will have 1 million or more in income after taxes?
Scores on a scholastic aptitude test are normally distributed with standard deviation σ=100 points. A group of 25 inner city high school students takes the test; their mean scores is x-bar = 440 points.
Give an example of a null and alternative hypotheses. This can be a personal item or something at work. Additionally, identify the Type I and Type II Errors that could occur with your decision-making process.
At the 5% level of significance, can we infer that the difference in the level of satisfaction with service between the two branches is wider than 5 p.c. points?
What is the probability that at least 8 of the next 15 errors are due to operator errors? What is the probability that no more than 3/10 failures are due to operators?
Be certain to mention what inferential statistics is and why we use it, what is random sampling, which is statistical significance and why we test it.
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