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The breaking strength (in kg/mmm) for a certain type of fabric has mean 1.86 and standard deviation 0.27.
(a) What is the probability that the sample mean breaking strength of a random sample of 100 pieces of fabric is less than 1 .8 kg/mm?
(b) What is the probability that the sample mean breaking strength of a random sample of 36 pieces of fabric is less than 1 .8 kg/mm?
(c) How large a sample size is needed so that the probability is 0.01 that the sample mean is less than 1.8?
Stem Cell Survey - Adults were randomly selected for a Newsweek poll. They were asked if they "favor or oppose using federal tax dollars to fund medical research using stem cells obtained from human embryos.
Determine the following probabilities: Events A and B are mutually exclusive events defined on common sample space.
A furniture store claims that a specially ordered product will take, on average, mean= 35 days (5 weeks) to arrive. The standard deviation of these waiting times is 5 days.
A defective picture tube was discovered in the latest shipment. What is the probability that it came from Tyson Wholesale?
A manufacturer claims that the mean lifetime, , of its light bulbs is 49 months. The standard deviation of these lifetimes is 9 months. Seventy bulbs are selected at random, and their mean lifetime is found to be 46 months.
Suppose that 98% of the customers in your market have Internet access, and you select a random sample of 500 customers. What is the probability that the sample has:
The state's smallest animal is a red-tailed gerbil, with a mean weight of 2.5 grams and a standard deviation of 0.25 grams. Assuming that the weights are normally distributed
What is a p-value in testing hypothesis? How does this p-value help us to decide to/not to reject a Null hypothesis? What might happen if we do not use this p-value in particular, when we are rejecting a Null hypothesis?
The factorial structure of treatments. What does this plot recommend about suitability of no-interaction assumption here?
Using a significance level of .01 to test this hypothesis, what is your decision rule?
You are investigating the flight characteristics of different kinds of birds. You collect a sample of 33 European swallows (Hirundo rustica) and measure their air-speed velocity in a borrowed wind tunnel.
In chi-square goodness-of-fit test when there is close agreement between observed frequency and expected frequency, chi-square test value will be small.
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