Find the margin of error
A medical researcher wishes to estimate what proportion of babies born at a particular hospital are born by caesarean section. in a random sample of 121 births 25% were caesarean. Find the margin of error for the 95% confidence interval.
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A Broadway theater offers 3 tickets per performance at 70% discounted price by drawing random lottery to the people waiting in a line before the show. Today, 10 people are waiting in a line to win a lottery.
These 7 rules are as follows: no smoking, regular exercising, use alcohol, get 7 to 8 hours of sleep, maintain proper weight, eat breakfast, and do not eat between meals. In how many ways can a person adopt five of these rules to follow:
If Y is a random variable that has an F distributions with v1 numerator and v2 denominator degrees of freedom, show that U=1/Y has an F distributions with v2 numerator and v1 denominator degrees of freedom.
At Western University the historical mean of scholarship examination scores for freshman applications is 920. A historical population standard deviation s = 165 is assumed known. Each year, the assistant dean uses a sample of applications to deter
The data below gives the logarithm to the base 10 of the volume occupied by algal cells on succesive days, taken over a period for which the realtive growth rate is approximately constant:
Make a point estimate of the population mean difference in accuracy performance for music versus no music in the classroom. Compute the 90% confidence interval for the population mean difference.
A calculator has the random number generator button which, when pushed displays a random digit (0,1,2,3,.....9). The button is pushed four times. Assuming the number generated are independent, what is the probability of obtaining one ‘0', on
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