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Chapter 8: Q.66 (page 481)
Which distribution should you use for this problem ?
The distribution for this problem is.
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A random sample of statistics students were asked to estimate the total number of hours they spend watching television in an average week. The responses are recorded in Table . Use this sample data to construct a % confidence interval for the mean number of hours statistics students will spend watching television in one week.
Table
The data in the Table are the result of a random survey of national flags (with replacement between picks) from various countries. We are interested in finding a confidence interval for the true mean number of colors on a national flag. Let the number of colors on a national flag.
Construct a confidence interval for the true mean number of colors on national flags.
Calculate the following:
a. lower limit
b. upper limit
c. error bound
Table shows a different random sampling of cell phone models. Use this data to calculate a % confidence interval for the true mean SAR for cellphones certified for use in the United States. As previously, assume that the population standard deviation is 蟽= .
| Phone Model | SAR | Phone Model | SAR |
| Blackberry pearl | Nokia E71x | ||
| HTC Evo Design 4G | Nokia N | ||
| HTC Freestyle | Nokia N | ||
| LG Ally | Sagem Puma | ||
| LG Fathom | Samsung Fascinate | ||
| LG Optimus Vu | Samsung Infuse 4G | ||
| Motorola Cliq XT | Samsung Nexus S | ||
| Motorola Droid pro | Samsung Replenish | ||
| Motorola Droid Razr M | Sony W5a walkman | ||
| Nokia Twist | ZTE C |
The data in the Table are the result of a random survey of national flags (with replacement between picks) from various countries. We are interested in finding a confidence interval for the true mean number of colors on a national flag. Let the number of colors on a national flag.
Construct aconfidence interval for the true mean number of colors on national flags.
How much area is in both tails (combined)?
In a recent sample of used car sales costs, the sample mean was with a standard deviation of . Assume
the underlying distribution is approximately normal.
a. Which distribution should you use for this problem? Explain your choice.
b. Define the random variablein words.
c. Construct a confidence interval for the population mean cost of a used car.
i. State the confidence interval.
ii. Sketch the graph.
iii. Calculate the error bound.
d. Explain what a 鈥� confidence interval鈥� means for this study.
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