Question

According to the local union president, the mean gross income of plumbers in the Salt Lake City area follows a normal distribution with a mean of $48,000 and a population standard deviation of $2,000. A recent investigative reporter for KYAK TV found, for a sample of 49 plumbers, the mean gross income was $47,600. At the 0.05 significance level, is it reasonable to conclude that the mean income is not equal to $47,600? Determine the p value.

**State the Null and Alternate hypothesis:****State the test statistic:****State the Decision Rule:****Show the calculation:****What is the interpretation of the sample data?****Show the P value**

Answer #1

Conclusion

we have insufficient evidence to conclude that the mean income is not equal to $47600

According to the local union president, the mean gross income of
plumbers in the Salt Lake area follows the normal probability
distribution with a mean of $45,000 and a population standard
deviation of $3,000. A recent investigative reporter for KYAK TV
found, for a sample of 120 plumbers, the mean gross income was
$45,500. At the .10 significance level, is it reasonable to
conclude that the mean income is not equal to $45,000? Determine
the p-value.
Please write neatly to...

For a recent year, the mean fare to fly from Charlotte, North
Carolina to Chicago Illinois, on a discount ticket was $290. A
random sample of 12 round trip discount fares on this route last
month shows:
286
290
285
291
287
275
262
289
274
276
297
262
At the 0.01 significance level, can we conclude that the mean
fare has decreased? What is the p value?
State the Null and Alternate hypothesis:
State the test statistic:
State the...

For a recent year, the mean fare to fly from Charlotte, North
Carolina to Chicago Illinois, on a discount ticket was $290. A
random sample of 12 round trip discount fares on this route last
month shows: 286 290 285 291 287 275 262 289 274 276 297 262 At the
0.01 significance level, can we conclude that the mean fare has
decreased? What is the p value?
1. State the Null and Alternate hypothesis:
2. State the test statistic:...

The mean income per person in the United States is $38,000, and
the distribution of incomes follows a normal distribution. A random
sample of 13 residents of Wilmington, Delaware, had a mean of
$48,000 with a standard deviation of $9,200. At the 0.100 level of
significance, is that enough evidence to conclude that residents of
Wilmington, Delaware, have more income than the national
average?
State the null hypothesis and the alternate hypothesis.
State the decision rule for 0.100 significance level....

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