Confidence Interval (1) When constructing a confidence interval estimate of the population mean μ, how do you decide between the normal distribution and Student t distribution...

Confidence Interval (1) When constructing a confidence interval estimate of the population mean μ, how do you decide between the normal distribution and Student t distribution...

A graph depicts IQ scores of adults and those scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the area of the shaded region.... (between the IQ scores of 108...

A retail shop accepts only cash or checks. Suppose that % of its customers carry cash, % carry checks, and % carry cash or checks (or both). What is the probability that a randomly...

The annual salary for a group of people is normally distributed with mean mu=182,000. It is also known that 72% earn more than $165,000. A random sample of 28 professionals is chosen from the group...

The mean weight of a sample of 201 pigs is 6.7 pounds with a population standard deviation of 1.6 pounds. Construct a 90% confident interval for the true mean of all pigs. Write a sentence interp...

Question 6 Which of the following is NOT TRUE concerning the graphic depiction ("the curve") of a distribution for means? Question...

Find the area under the standard normal curve to the left of z = −1.53. This may also be stated as P(z < −1.53). P(z < - 1.53) = 0.0630 This probability can also be calculated...

decide whether this statement makes sense or does not make sense and explain your reasoning

On an IQ test where the mean of the test is 100 and S is 15, the µ of Group A was 105 compared with µ of Group B being 85. Take the information and calculate the effect size which is the difference...

What is the probability of an event that is impossible? Suppose that a probability is approximated to be zero based on empirical results. Does this mean that the event is impossible? What is the...

A big-brand-name dishwasher, which costs $800.00, has a 20% chance of needing to be replaced in the first 2 years of purchase. A two-year extended warranty costs $112.10 on a dishwasher. ...

sample size needed

The Empirical Rule indicates that we can expect to find what proportion of the sample included between ± 1 standard deviation?

What differentiates the two formulas Σ (x – xbar)^2/n-1 from Σ (x – µ)^2/n, and why the difference?

houses prices are usually reported as the Median price rather than the Mean (average) price. Why would this be true for a set of prices like: $120,000; $125,000; $110,000; $199,000; $100,000?

Assume that cases of mumps are random and independent and the number X of monthly mumps cases in Michigan has approximately the Poisson distribution with = 0.2. What is the probability...

What is an example of when you would want consistent data and, therefore, a small standard deviation? Example: Race-car Driver Small Standard Deviation: Understanding RPM and when...

For a score of 40, where the lowest level of measurement is 1, the upper real limit is how do i solve this

The daily energy intakes of children follow a normal distribution with a mean of 1123 kcal and a standard deviation of 214 kcal. The recommended minimum daily intake is 1700 kcal. What percent of...

Consider the probability that exactly 90 out of 145 computers will not crash in a day. Assume the probability that a given computer will not crash in a day is 63%. Approximate the probability...