Question

In: Statistics and Probability

The following data represent the battery life, in hours, for a random sample of ten full...

The following data represent the battery life, in hours, for a random sample of ten full charges on ipod music player.

7.3 10.2 12.9 10.8 12.1 6.6 10.2 9.0 8.5 7.1

a) construct a 90% confidence interval for the mean number of hours the battery will last on this player.

b) Suppose you wanted more accuracy. What can be done to increase the accuracy of the interval without changing the level of confidence?

thank you.

Solutions

Expert Solution



Related Solutions

The following summary statistics represent the hours of battery life for 4 brands of laptops. At...
The following summary statistics represent the hours of battery life for 4 brands of laptops. At the 0.05 significance level, do the data provide sufficient evidence to conclude that a difference exists between the the battery life of the fourdifferent brands? Column n Mean Std. Dev. Brand_A 8 7.69 1.62 Brand_B 8 10.44 2.45 Brand_C 10 8.55 2.52 Brand_D 8 5.91 1.30
The following data represent the level of happiness and level of health for a random sample...
The following data represent the level of happiness and level of health for a random sample of individuals from the General Social Survey. A researcher wants to determine if health and happiness level are related. Use the αα = 0.05 level of significance to test the claim. Health Excellent Good Fair Poor Very Happy 271 261 82 20 Pretty Happy 247 567 231 53 Not Too Happy 33 103 92 36 *Source: General Social Survey 1) Determine the null and...
A random sample of ten professional athletes produced the following data. The first row is the...
A random sample of ten professional athletes produced the following data. The first row is the number of endorsements the athlete has and the second row is the amount of money made (in millions of dollars) by the athlete.     what is the y-intercept of ^ and what does it represent? what is the linear coefficient? Number of Endorsements 0 3 2 1 5 5 4 3 0 4 Profit (in Millions) 2 8 7 3 13 12 9 9...
A random sample of ten professional athletes produced the following data. The first row is the...
A random sample of ten professional athletes produced the following data. The first row is the number of endorsements the athlete has and the second row is the amount of money made (in millions of dollars) by the athlete.    If a professional athlete did 6 endorsements, what could they expect to profit according to the regression equation? Round to one decimal point. Number of Endorsements 0 3 2 1 5 5 4 3 0 4 Profit (in Millions) 2...
The following data represent the pH of rain for a random sample of 12 rain dates....
The following data represent the pH of rain for a random sample of 12 rain dates. A normal probability plot suggests the data could come from a population that is normally distributed. A boxplot indicates there are no outliers. Complete parts​ (a) through​ (d) below. 5.30 5.72 4.99 4.80 5.02 4.57 4.74 5.19 5.29 4.76 4.56 4.91 ​(a) Determine a point estimate for the population mean. A point estimate for the population mean is nothing. ​(Round to two decimal places...
The following data represent the pH of rain for a random sample of 12 rain dates....
The following data represent the pH of rain for a random sample of 12 rain dates. A normal probability plot suggests the data could come from a population that is normally distributed. A boxplot indicates there are no outliers. Complete parts​ a) through​ d) below. 5.05 5.72 5.24 4.80 5.02 4.59 4.74 5.19 5.29 4.76 4.56 5.70 LOADING... Click the icon to view the table of critical​ t-values. c) Construct and interpret a 99​% confidence interval for the mean pH...
The following data represent the pH of rain for a random sample of 12 rain dates....
The following data represent the pH of rain for a random sample of 12 rain dates. A normal probability plot suggests the data could come from a population that is normally distributed. A boxplot indicates there are no outliers. Complete parts​ (a) through​ (d) below 5.58 5.58 5.72 5.24 5.24 4.80 5.02 5.03 5.03 4.74 5.19 4.87 4.87 4.76 4.56 4.91 4.91 ​(a) Determine a point estimate for the population mean. A point estimate for the population mean is nothing....
The following data represent the dividend yields? (in percent) of a random sample of 28 publicly...
The following data represent the dividend yields? (in percent) of a random sample of 28 publicly traded stocks. 2.55   0.47 1.59 0.44   0.07 2.53 0.14 2.04 0.47 2.98 0 2.88 3.2 0.31 0.57 3.43 2.35 0.97 1.31 2.94 0 0.37 0 1.93 0 1.61 0.44 0.23 Compute the? five-number summary
The following data represent the pH of rain for a random sample of 12 rain dates....
The following data represent the pH of rain for a random sample of 12 rain dates. A normal probability plot suggests the data could come from a population that is normally distributed. A boxplot indicates there are no outliers. Complete parts​ a) through​ d) below. 5.58 5.72 4.89 4.80 5.02 4.58 4.74 5.19 4.61 4.76 4.56 5.69
The following data represent the pH of rain for a random sample of 12 rain dates....
The following data represent the pH of rain for a random sample of 12 rain dates. A normal probability plot suggests the data could come from a population that is normally distributed. A boxplot indicates there are no outliers. Complete parts​ (a) through​ (d) below. Open in StatCrunch + Copy to Clipboard + Open in Excel + 5.585.58 5.72 4.624.62 4.80 5.02 4.684.68 4.74 5.19 5.345.34 4.76 4.56 5.305.30 ​(a) Determine a point estimate for the population mean. A point...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT