98% 3:32 PM ooo AT&T; webassign.net -16 points My Notes The gypsy moth is a seri
ID: 3170273 • Letter: 9
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98% 3:32 PM ooo AT&T; webassign.net -16 points My Notes The gypsy moth is a serious threat to oak and aspen trees. A state agriculture department places traps throughout the state to detect the moths. When traps are checked periodically, the mean number of moths per trap is only 1.1, but some traps have several moths. The distribution of moth counts is strongly right skewed, with standard deviation 1.2. Arandom sample of 30 traps has x 0.8 and s E 2.3. Let X the number of moths per trap (a) For the population distribution, what is the mean? standard deviation? b) For the distribution of the sample data, what is the mean? standard deviation? (c) What shape does the distribution of the sample data probably have? o Left skewed Right skewed o Approximately Normal Exactly Normal o (d) For the sampling distribution of the sample mean with n E 30, what is the mean? standard deviation? Use 3 decimal places (e) What is the shape of the sampling distribution of the sample mean? o Left skewed o Approximately Norma Exactly Normal o o Right skewed -13 points My Notes Government data show that 7% of the American population are at least 75 years of age. To test a random-digit dialing device, you use the device to call randomly chosen residential telephones in your county. Of the 290 members of the households contacted, 6% are 75 years or older.Explanation / Answer
A.a) for the population distribution
Mean=1.1
Standard Deviation=1.2
A.b) for distribution of sample data
mean=0.8
Standard Deviation=2.3
A.c) the shape of the distribution will be right skewed
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