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An airline, believing that 3% of passengers fail to show for flights, overbooks (sells more tickets than there are seats). Suppose that for a particular flight involving a jumbo-jet with 261 seats, the airline sells 276 tickets. What is the probability that the airline will not have enough seats for all the ticket holders who show for the flight? (Use 3 decimal places)
A hospital human resources manager finds that the local average starting salary for nurses is $24,000. She randomly samples 10 nurse's salaries at the hospital and calculates a mean of $23,450 and a standard deviation of $400.
At the 5% level of significance, would we reject the null hypothesis that the mean breaking load is 510 pounds or more?
a. Formulate the null and alternative hypotheses. b. Which statistical test would you use? Why?
State the number of degrees of freedom that are associated with each of the following extra sum of squares and why this is the case:
The p-value for a test statistic is .085, what is the minimum level of significance required to reject the null hypothesis?
Assume that a normal model with a mean 263 days and standard deviation can describe the duration of human pregnancies 12 days. At least how many days should the longest 30% of all pregnancies last?
Describe whether statements regarding statistical significance are true or false. When your results are found to be statistically significant, can one conclude that they will have a meaningful effect in the clinic.
a) What is the probability that for any day, the number of special orders sent out will be more than 4? b) What is the standard deviation of the number of special orders sent out daily?
Draw the scatter diagram. Does it appear that x and y are related? If so, how? Test to determine whether there is evidence of a linear relationship.
At the .01 significance level, can we conclude that there is more variation?
The theoretical probability of undesirable side effects resulting from taking Grebex is 2 in 19. If 570 people take Grebex to lower their blood pressure, how many will encounter undesirable side effects?
Using the raw measurement data presented below, calculate the t value for independent groups to determine whether or not there exists a statistically significant difference between the salaries of female and male human resource managers.
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