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Gender Selection
The genetics and IVF Institute conducted a clinical trial of the XSORT method designed to increase the probability of conceiving a girl. As of this exam 574 babies were born to parents using the XSORT method and 525 of them were girls. Use the sample data to construct a 95% confidence interval estimate of the percentage of girls born to parents using the XSORT method.
A large electronics company wants to estimate the proportion of all households that own GPS machines. What sample size is required that would give the maximum error of 2.0% for a 95% confidence interval? An unscientific survey had a result of 30%.
What is the expected number of days on which all 50 loaves will be sold?- Find the probability of selling all 50 loaves on at least 20 days.
A better model for repeating an exam. A more realistic probability model for Elaine's attempts to pass an exam in the previous exercise is as follows.
School is about to begin. The janitor has all the lockers closed. All 1000 of them.
Find the mean and standard deviation for these data.- What is the variance for these data?- Find the median value for the dataset.
How do police officers know if he or she has the proper justification to conduct a search?
You're considering paying $5 to buy a ticket in a local lottery. You were told that 10,000 tickets will be sold. There are 5 prizes. The first prize is $5,000, the second is $1,000, the third is $500, the fourth is $100 and the last prize is $10.
Thirsty? Researchers randomly assigned participants either a tall, thin highball glass or a short, wide tumbler, each of which held 355 ml.
Whether they voted for the Democratic or for the Republican candidate in the last congressional election. Which of these variables are categorical and which are quantitative?
"In 1848 the forces of liberalism, democracy, and nationalism met in a head-on collision. Autocracy and capitalism emerged victorious."
Randomly chosen people were observed for about 10 seconds in several public places, such as malls and restaurants, to see whether they smiled during that time.
Find the probability that a randomly selected student has a runny nose and Find the probability that a randomly selected student has a sore throat or a runny nose
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