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Q1) Results from survey of 1000 respondents, point out that 545 favour the dealth penalty for capital crimes. By using a 90% confidence level. Create confidence interval estimate for population proportion.
Q2) Find out minimum sample size for margin of error of 6 days and population standard deviation of 18 days using confidence level of 95% to evaluate an unknown population mean for number of days missed from work per year.
Let X1, X2, ... , X50 denote actual net weights of 50 randomly selected 80-lb bags of concrete mix.
a) If expected weight of each bag is 80-lb and standard deviation is 2-lb, compute P(79.75 £ X bar £ 80.25).
b) If expected weight of each bag is 79.5-lb rather than 80-lb, so that on average bags are under-filled, but standard deviation is still 2-lb, compute P(79.75 £ X bar £ 80.25).
(A) What sums are needed to calculate a correlation coefficient? (B) What are the two ways of testing a correlation coefficient for significance?
A sample of 40 decaffeinated-coffee drinkers showed a mean of 5.84 cups per day, with a standard deviation of 1.36 cups per day. Use the .01 significance level. Compute the p-value.
On the same chart, produce a graph showing the original probability mass function, and a line graph showing your selected continuous probability density function.
Find out the area using Normal distribution. As, if Z is a standard normal variable find out the probability that Z lies.
A state-wide sample survey is to be made. First, the state is subdivided into counties. Seven counties are selected at random and further sampling is concentrated on these seven counties.
To demonstrate the process is in control or out of control utilizing p-chart. A company which produces nails has retained you as a consultant.
Determine probability of generating six digits and getting code consisting of 1, 2, 3, ..., 6 if each digit can be repeated?
Computing the mean and standard deviation for the given data - Find the value for the new standard deviation
What is the probability of a fatal accident over a lifetime?
Determine the expected value and standard error of the sum of 400 draws?
What are the minimum and maximum heights it should use as a basis for its design?
The field of statistics can be roughly subdivided into two areas: descriptive statistics and probability.
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