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The heights of 20- to 29-year-old females are known to have a population standard deviation 1) = 2.7 inches. A simple random sample of n = 15 females 20 to 29 years old results in the following data:
63.1 67.9 64.8 62.2 65.4
63.3 66.2 68.2 69.7 64.1
68.4 69.9 67.3 64.5 70.2
Suppose all cities are directly connected except B and C are not directly connected. How many different flight plans are available to the salesperson?
Based on these data, determine the 95 percent confidence interval estimate for true population mean?
In a random sample of 35 trading days, the volume of a particular stock is recorded to determine whether the mean volume of the stock changed from its 2007 value of 35.14 million shares.
The clinic estimates that the true population standard deviation is around $2,100. If the confidence level is 95%, find the required sample size in order to meet the desired accuracy.
What is the probability that exactly 3 tomatoes in a randomly selected tray of 20 tomatoes will be too ripe. In each tray of 20 tomatoes, how many would be expected to be too ripe?
Bill heats his house with natural gas. The gas usage is measured in therms (T). In January of 2007 he used 125 therms over 34 days (D) and the average temperature (T) was 49 degrees farenheit.
support the consumer group's claim that fewer than 75% of the claims were settled within 5 weeks? Test using the traditional approach with α = 0.05. Determine which test statistic applies, and calculate it
In a shipment of 59 vials, only 18 does not have hairline cracks. 6 vials are randomly selected from the shipment. Find the probability that at least one of the 6 selected vials has a hairline crack.
Which of the following would be an appropriate alternative hypothesis?
5000 light bulbs each with an average life of 500 hours, standard deviation is 100 hours. Find the percentage of bulbs that can be expected to last between 540 hours and 780 hours.
The mean of a normal probability distribution is 60; the standard deviation is 5.
For three independent samples, each with n = 100, the respective sample proportions are 0.30, 0.35, and 0.25. Use the 0.05 level in testing whether the three population proportions could be the same.
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