Blog

In a binomial distribution, if n=10, p=.3 and q=.7 and where n*p*q= 2.1 would you use a normal approximation?

Researchers are conducting a population-based study to determine the prevalence of COVID-19 antibodies.  To do this they are first dividing the population by socio-economic status and sampling with these socio-economic status groups. What kind of sampling is this? 

The boy in “Chickamauga” is revealed to be: 

A random sample of sale prices of homes yielded the following summary information: MIN= $48,000, Q1= $83,000 Median= $129,000, Q3= $160,000, MAX= $270,000. b) Calculate the Lower Fence

Which of these items plays a crucial part in 1408’s conclusion?

Provide an appropriate response.A small computing center has found that the number of jobs submitted per day to its computers has a distribution that is approximately bell shaped, with a mean of 63 jobs and a standard deviation of 7. Where do we expect most (approximately 95%) of the distribution to fall?

If the population from which samples are drawn is non-normally distributed, the sample distribution of the means will be non-normally distributed. 

Consider the following data: 1, 3, 6, 8, 10. Find the sample standard deviation. Round to 2 decimals. 

Use the following information to answer the question. The mean age of lead actresses from the top ten grossing movies of 2010 was 29.6 years with a standard deviation of 6.35 years. Assume the distribution of the actresses’ ages is approximately unimodal and symmetric.Between what two values would you expect to find about 68% of the lead actresses ages?

Solve the problem.In the following histogram, what can you conclude about the bin width?