Question

In: Statistics and Probability

Consumer Reports tested 11 brands of vanilla yogurt and found these numbers of calories per serving:...

Consumer Reports tested 11 brands of vanilla yogurt and found these numbers of calories per serving:

130, 160, 150, 120, 90, 110, 170, 140, 110, 130, 90

If we want to create a 95% confidence interval for the average calorie content of vanilla yogurt, what would be the standard error of the sample average? (Round to two decimal places.)

Solutions

Expert Solution

Solution:

x x2
130 16900
160 25600
150 22500
120 14400
90 8100
110 12100
170 28900
140 19600
110 12100
130 16900
90 8100
∑x=1400 ∑x2=185200


Mean ˉx=∑xn

=130+160+150+120+90+110+170+140+110+130+90/11

=1400/11

=127.2727
Sample Standard deviation S=√∑x2-(∑x)2nn-1

=√185200-(1400)211/10

=√185200-178181.8182/10

=√7018.1818/10

=√701.8182

=26.4919

The standard error = (s /n)

= (26.49 / 11)

=7.987

The standard error = 7.99

Degrees of freedom = df = n - 1 = 11 - 1 = 10

At 95% confidence level the t is ,

  = 1 - 95% = 1 - 0.95 = 0.05

/ 2 = 0.05 / 2 = 0.025

t /2,df = t0.025,10 =2.228

Margin of error = E = t/2,df * (s /n)

= 2.228* (26.49 / 11)

= 26.49

Margin of error = 26.49

The 95% confidence interval estimate of the population mean is,

- E < < + E

127.27 - 26.49 < < 127.27 + 26.49

109.47 < < 145.07

(109.47 , 145.07 )


Related Solutions

Consumer Reports tested 11 brands of vanilla yoghurt and found these numbers of calories per serving:...
Consumer Reports tested 11 brands of vanilla yoghurt and found these numbers of calories per serving: 130 160 150 120 120 110 170 160 110 130 90 Use a 0.05 significance level to test the claim that the mean serving is equal to 120 calories, as a diet guide claim. 1. State the hypotheses and identify the claim 2. Find the critical value or values 3. Find the test statistic. First state the calculator command used to find it.   4....
A consumer group tested 11 brands of vanilla yogurt and found the numbers below for calories...
A consumer group tested 11 brands of vanilla yogurt and found the numbers below for calories per serving. find the test statistic (t) and the P-value 130 160 145 115 125 110 175 155 110 125 95
A company tested 11 random brands of vanilla yogurt and found the number of calories per...
A company tested 11 random brands of vanilla yogurt and found the number of calories per serving given below.​ (Note that more than 110 different brands of vanilla yogurt​ exist.) Complete parts a through c. 140 160 140 110 120 120 170 160 100 120 80 Is the Independence Assumption​ met? Is the Randomization Condition met or is the sample suitably​ representative? Is the​ 10% Condition​ met? Is the Nearly Normal Condition​ met? ​b) Find a​ 95% confidence interval for...
A company tested 11 random brands of vanilla yogurt and found the number of calories per...
A company tested 11 random brands of vanilla yogurt and found the number of calories per serving given below.​ (Note that more than 110 different brands of vanilla yogurt​ exist.) Complete parts a through c. 120  160  150 130    130   110    170    160    110 130    80     ​a) Check the assumptions and conditions for inference. Is the Independence Assumption​ met? Yes No Is the Randomization Condition met or is the sample suitably​ representative? Yes No Is the​ 10% Condition​ met? No...
10 brands of vanilla yogurt and found these numbers of calories per serving: 130 160 150...
10 brands of vanilla yogurt and found these numbers of calories per serving: 130 160 150 120 110 170 160 110 130 90 - Check the assumptions and conditions for inference. -Create a 95% confidence interval for the average calorie content of vanilla yogurt. -A diet guide claims that you will get an average of 120 calories from a serving of vanilla yogurt. What does the evidence above indicate? Use your confidence interval to test an appropriate hypothesis and state...
1.) The following data are the calories per half-cup serving for two popular ice cream brands...
1.) The following data are the calories per half-cup serving for two popular ice cream brands reviewed by Consumer Reports (July 1999): Brand A: 270 150 170 140 160 160 160 290 Brand B: 190 190 160 170 150 110 180 170 Construct a 90% confidence interval for the difference in the mean calories per half-cup for the two brands of ice cream. Interpret your results. 1a.)How many samples? 1b.) Full name of interval? 1c.) Is this problem for means...
Problem 2. You wish to determine the energy content per gram and Calories per serving of...
Problem 2. You wish to determine the energy content per gram and Calories per serving of a chocolate chip cookie and a banana bread slice from the Student Union to decide which is less “fattening.” The intact cookie and banana bread slice you are analyzing weigh 72.501 g and 69.003 g, respectively. Before you can analyze the samples, the calorimeter heat capacity must be determined. It is known that combustion of 1.000 g of benzoic acid releases 26.44 kJ of...
If a product contains 100 calories and 5 grams of fat per serving, what is the...
If a product contains 100 calories and 5 grams of fat per serving, what is the percentage of calories from fat in the product? A. 35% B. 45% C. 5% D. 20% 1 points    QUESTION 2 Solid fats generally have a high proportion of what type of fatty acids? A. Saturated B. Unsaturated C. Monounsaturated D. Polyunsaturated 1 points    QUESTION 3 The lifestyle management techniques recommended by the American Heart Association and the American College of Cardiology include...
How many calories are in a hot dog? Consumer Reports magazine presented the following data on...
How many calories are in a hot dog? Consumer Reports magazine presented the following data on the number of calories in a hot dog for each of 17 brands of meat hot dogs: 173 191 182 190 172 147 146 139 175 136 179 153 107 195 135 140 138 a) Make a stemplot of the distribution of calories in meat hot dogs and briefly describe the shape of the distribution. b) Most brands of meat hot dogs contain a...
A potato chip company claims that their chips have 130 calories per serving. We think this...
A potato chip company claims that their chips have 130 calories per serving. We think this claim is too low, so we buy 40 bags of chips and test the calories per stated serving size.  Our sample yields a mean of 132 calories per serving, with a standard deviation of 6 calories. Is the manufacturer's claim too low? \ Use alpha = 0.05.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT