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To get a C in history, Nandan must average 74 on four tests. Scores on the first three tests were 69, 74, and 65. What is the lowest score that Nandan can get on the last test and still receive a C?
You wish to be 95% confident and have an error of 0.4 mpg. The standard deviation is estimated at 1.8. How big must the sample be?
The researchers found that subjects who answered immediately made the best decisions and that "the longer our participants thought about their answers, the more likely they were to include irrelevant information at the expense of relevant informat..
A random sample of 14 days shows Xbar = $502.95 and s = $64.00. You can assume normality. Using alpha = 4%, is the sampling result significant? Explain.
a mean of 20 minutes and a standard deviation of 3 minutes. how long does it take the slowest 10% of the students to walk from the dorms to the chemistry lab.
Suppose that students in a particular school are all very competent. For each individual, the probability that they will pass the proficiency exam (independent of thier classmates) is 0.99
A random sample of 22 service times (in minutes) gives s-square = 8. Give a 95% confidence interval for the variance of service time at the bank.
Following are speeds of 40 cars clocked by radar on a particular road in a 35-mph zone on a particular afternoon; Make (a) a frequency table, (b) a histogram, and (c) a frequency polygon. Then describe the general shape of the distribution.
What is the Bonferroni adjustment? What would the Bonferroni adjustment be for a study with four groups for which a researcher decided to use t-tests?
Construct a 90% confidence interval for the mean nicotine content of this brand of cigarette. The population of total compensations of CEOs in the service industry is approximately normally distributed.
Assume that for population of students at school, distribution of x is well approximated by normal curve with mean 48 min and standard deviation 4 min.
Carry out the global test of hypothesis to find out whether any of the regression coefficients are not equal to 0. Use.05 level of significance.
Vote in favor of ABC in the elections. Derive a 95 % confi dence interval for the mean proportion of voters in Sile who will vote for ABC in the coming elections.
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