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The number of chocolate chips in an 18-oz bag of generic cookies is approximately normally distributed with a mean of 1124 and a standard deviation of 113 chips.
a) What is the probability that a randomly selected bag has between 1000 and 1200 chips?
b) What is the probability that a randomly selected bag has fewer than 1000 chips?
c) If a bag has more chips than 70% of the other bags, how many chips must it have?
Concrete blocks are to be used in the foundations of several buildings. The specifications state that the minimum arithmetic mean compressive strength of a sample of blocks must be 1,000 pounds per square inch (psi).
Five students took a math test before and after tutoring. Their scores were as follows. Using a 0.01 level of significance, test the claim that the tutoring has an effect on the math scores.
While in Paymor Hospital such exams were given in 110 out of 200 cases. In a left-tailed test for equality of proportions, the p-value is?
An internet company has redesigned its website to improve the online experience of its customers. To test whether the new design has improved its customers' experience it has asked people to comment on whether they prefer the new format or not.
The five year surival rate for Caucasians for all forms increased from 37% in 1960 to 58% now. Express this change in two ways (1) as an absolute difference in terms of percentage points and (2) as a relative difference in terms of percent.
Thirty-five percent of the democrats and 70% of the republicans favor the bill. the bill needs a simple majority to pass. using a probability tree, determine the probability that the bill will pass.
Each organization gets a 90% confidence interval. About how many of these intervals should cover the population average?
Imagine there are exactly m opportunities to cross safely by the time the nth shock occurs. What is the probability that the mth opportunity is a close call (that it occurs immediately before the nth shock).
Write a one-page report to Ms. Gupta presenting your conclusions regarding the market performance of Brand 1.
Problem: Two rainstorms occurred in one week in a certain area. In the first storm 30 ml of rain fell per hour, and in the second storm 20 ml of rain fell per hour.
Pilot sample of n = 50 tires illustrated sample standard deviation equal to 4,000 miles. Based on this information, required sample size is?
what sample size should be used in the funding decision study? Use σ = $4000 as a planning value. ________________
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