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A theater has a seating capacity of 1050 and charges $4 for children, $6 for students, and $8 for adults. At a certain screening with full attendance, there were half as many adults as children and students combined. The receipts totaled $6600. How many children attended the show?
The article "Housework around the World" (USA Today, September 15, 2009) included the percentage of women who say their spouses never help.
colormetric method is used to test lake water for nitrates. if water specimens contain nitrates a solution dropped into
Calculate the t test statistic. Can you reject ρ = 0? (e) Use Excel's function =TDIST(t,deg_freedom,tails) to calculate the two-tail p-value.
In the past, of all the students enrolled in "Basic Business Statistics" 10% earned A's 20% earned B's, 30% earned C's, 20% earned D's and the rest either failed or withdrew from the course.
Lunchtime. Does how long children remain at the lunch table help predict how much they eat? The table gives data on 20 toddlers observed over several months.
The differences and similarities between descriptive and inferential statistics will also be examined with examples provided for each.
The Weschsler IQ test has a μ =100 and a σ = 15. A vitamin company said if people took vitamin X for 30 days their IQ would improve. A simple random sample of 49 people took the vitamins for 30 days. They then took the IQ test. The mean IQ of the ..
Who turned a telescope on the stars, saw sunspots, and spent his final years under house arrest?
Consider the instrumentation amplifier of Fig. 2.20(b) with a common-mode input voltage of +3 V (dc) and a differential input signal of 100-mV peak sine wave. Let 2R1 = 2 kΩ, R2 = 50 k Ω, R3 = R4 = 10 kΩ. Find the voltage at every node in the circ..
On time. A Department of Transportation report about air travel found that, nationwide, 76% of all flights are on time.
If you were comparing the two groups, what measures would you use, and why?In which of the two graphs are the mean and median closer together, and why?
if the population means and common variance were known, what would the value of MSBG be if it were giving perfectly accurate information? How does this differ from the value estimated by MSWG?
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