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in an irs study, it takes a mean of 330 minutes for taxpayers to prepare, copy, and electtronically file a 1040 tax form. this distribution of times follows normal distribution and standard deviation is 80 minutes. a consumer watchdog agency selects a random sample of 40 taxpayers. What is the standard error of the mean? What is the likehood the sample mean is greater than 320 minutes?
Perform a two-tailed hypothesis test on both the legal services satisfaction and the sentence satisfaction variable's data using a .05 significance level.
What is the proportion of people surveyed that rated the subway system from 3 to 4. What is the proportion of people surveyed rated the Subway System from 1 to 3.
Using a level of significance of .01, is there evidence that the first year female high school teachers are receiving lower salaries? Fully explain your answer.
Rachel's doctor suspects she is suffering from hypoglycaemia. The amount of glucose in the bloodstream varies and a person with hypoglycaemia has an average blood glucose level of less than 65 mg/dL.
Assume the probability that a person has the desease is 0.08 for all people, independently of each other. Compute the total expected number of tests necessary.
Computing relative frequencies in a contingency table and a survey of a sample of 347 people is conducted. The survey's respondents are classified according to their political affiliation and their opinion on a bill.
Assume that a single radar unit used to detect incoming missiles has a probability of 0.90 of correctly detecting an incoming missile attack.
A random sample of teachers from Georgia and an independent random sample of teachers from Indiana have been asked to report their mean annual income.
A genetic experiment with peas resulted in one sample of offspring that consisted of 438 green peas and 159 yellow peas.
Compute the score based on their appropriate class means and standard deviations:
High School GPA is normally distributed with a mean of 3.06 and a standard deviation of 0.40. The probability of a randomly chosen student having a HS GPA between 3.54 and 3.80 is
A special test is given to people complaining of sever headaches. if someone has a brain tumor, the test is positive with a probability of .8 (80%).
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