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For a normally distributed population with a mean of 475 and standard deviation of 30 answer the following questions.
1: What is the probability of finding a value below 470.8? (ANSWER IN DECIMAL FORM TO 4 DECIMAL PLACES)
2: What percent of values are above 485.2? (ANSWER AS A PERCENT TO 2 DECIMAL PLACES...INCLUDE PERCENT SIGN WITH ANSWER)
3: The bottom 20% of observations are below what value? (ANSWER TO 1 DECIMAL PLACE)
4: What value would you expect to find the top 15% above? (ANSWER ROUNDED UP OR DOWN TO NEAREST WHOLE NUMBER- NO DECIMAL PLACES)
Verify that this gambling interpretation leads to the correct answer for all starting states in the examples that you worked in Exercise 28.
Construct a 90% confidence interval of the population mean time spent on social media each day.
For each of the following situations, would you recommend\ a sample or a census? Explain your reasoning in each case.
Criminals are basically stupid, because anyone who isn't basically stupid wouldn't be a criminal.
DuraTunes claims a mean battery life of 11 hours, while RockReady advertises 12 hours. The standard deviations are 2 hours for DuraTunes and 1.5 hours for RockR
a decision maker is considering including two additional variables into a regression model that has as the dependent
the makers of a soft drink want to identify the average age of its consumers. a sample of 55 consumers was taken. the
There are four distinct types of human blood denoted by O, A, B and AB. Suppose that these types occur with the following frequencies: 0.45, 0.40, 0.10, 0.05, respectively. If 20 people are chosen at random, what is the probability that:
Obtain an explicit expression for the reliability of a system consisting of a parallel arrangement of two components, C1 and C2 , with respective reliabilities, R1 and R2. Explain in words what the expression for the system reliability means in terms..
Construct a scatter plot for these data.- Find the estimated regression line. Add a graph of the estimated regression line to the scatter plot in part (a).
Name one advantage of displaying the information in two pie charts and one advantage of displaying the information in a single bar graph.
The researchers produce a new variety with a mean weight of 75 grams, which meets the 4% goal. What is the standard deviation of the weights of these new Romas?
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