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The average flight from point A to point B takes 100 minutes with a standard deviation of 10 minutes.
a. What is the probability that a flight will take more than 95 minutes?
b. What is the probability that a flight will take between 95 and 97 minutes?
A manufacturer of batteries for "kids' toys" wishes to investigate the length of time a battery will last. Tests results on a sample of 10 batteries indicated a sample mean of 5.67 and a sample standard deviation of 0.57.
Can the president conclude that the average family income at his school is significantly different than the population mean family income of the reported university?
The mean arrival rate is 15 cars per hour. What is the probability that 20 or more cars will arrive during any given hour of operation?
Oxytocin were more likely to give their money to a trustee compared to people who inhaled an inactive placebo. For this experimental study, identify the independent variable and the dependent variable.
The manager of a department store wants to determine what proportion of people who enter the store use the store's credit cards for their purchases.
Based on comparing the computed statistics to the critical value which of the following is true - study is designed to investigate whether there is a difference in response to various treatments in patients with rheumatoid arthritis.
Calculate a 95% confidence interval for the mean endowment of all the private colleges in the United States assuming a normal distribution for the endowments.
a shipment of 100 cereal boxes is delivered to a grocery shop. the manager is told that the weights of cereal boxes are
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead.
The daily food consumption for the sample averages 18.7 with SS=2475. Using a two-tailed test at the .05 level, can the researcher conclude that temperature has an effect on eating behavior?
Determine the average amount of time that a guest spends checking in. How would this change under each of the state options?
Explore the descriptive statistics and draw some scatter plots. Does this meet the basic assumptions of regression?
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