How much does a sleeping bag cost? Backpacker Magazine took a random sample of the cost of 31 sleeping bags that should keep you warm above 20°F and found that the mean cost was $ 119.75 with a standard deviation of $17.20. Use a calculator to build a 95% confidence interval for the population mean price of all of these types of sleeping bags. Then write a sentence or two to explain what your confidence interval means.

Q: A random sample of  46  four-year-olds attending day care centers provided a yearly tuition average…

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Q: You measure 44 textbooks' weights, and find they have a mean weight of 73 ounces. Assume the…

A: The confidence level is provided as 99%. The level of significance = 1 – confidence level = 1 – 0.99…

Q: Wildlife biologists inspect 200 deer taken by hunters and find 45 of them carrying Lyme disease…

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Q: Interpret the results. OA. You can be certain that the population mean price of the stock is either…

A: It is given that • The 90% confidence interval is CI = ( 109.87, 115.13 )• The 95% confidence…

Q: A random sample of 54 four-year-olds attending day care centers provided a yearly tuition average of…

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Q: You measure 50 dogs' weights, and find they have a mean weight of 30 ounces. Assume the population…

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Q: A survey of 81 individuals finds that the average amount they spend on entertainment each month is…

A: Given  n=81, Xbar=145,s=54 We want to find 95% CI for population mean

Q: Choose a quantitative variable.  Measure it on two different samples of 10, drawn from two different…

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Q: A learn-to-type software program claims that it can improve your typing skills. To test the claim…

A: We make the following table for the difference from the given information  Typing Speeds (in Words…

Q: What is the correct conclusion? O A. Since the interval contains the proportion stated in the null…

A: The correct conclusion is: If confidence interval contains value of parameter in null hypothesis…

Q: You are given the sample mean and the population standard deviation. Use this information to…

A: Given Data: Confidence level - 90%: The expression for the confidence level is,

Q: A medical director needs to know the proportion of patients who have a single bed in their room. A…

A: It is given that sample size (n) is 200 and p-hat value is 0.59.

Q: What changes the width of a confidence interval? A marketing director wants a 95% confidence…

A: Confidence interval is the range of values  and it contains the true population parameter with in…

Q: p'= α %4 || Margin of Error: E We are 87% confident that the proportion of Americans who feel that…

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Q: In a survey, 13 people were asked how much they spent on their child's last birthday gift. The…

A: We have to construct ci.

Q: Determine the sample size for a on-line survey with a variability of 30% and a 95% confidence…

A: Sample size n=z2(p*q)/e2

Q: A survey of 26 individuals found that they spent an average of $39.21 on exercise attire for the…

A: Confidence interval is an inference process which is used to estimate the population parameter. The…

Q: sample of 35 students was taken from the local university. These students spent an average of $180…

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Q: How much does the fat content of Brand X hot dogs vary? To find out, researchers measured the fat…

A: Let Y: Fat content of Brand X hot dogs n=10 Given that 95% Confidence interval(CI) for population…

Q: You measure 35 textbooks' weights, and find they have a mean weight of 36 ounces. Assume the…

A: Given information- Population standard deviation, σ = 9.3 ounces Sample size, n = 35 Sample mean,…

Q: 2. I want to create a confidence interval for the salaries of statistics teachers in America. I want…

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Q: A survey of 100 men found that 68% said they find it hard to buy holiday gifts that convey their…

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Q: one with a 95% confidence level and the other with a 99.7% confidence level. Which interval is…

A: Confidence interval is probability, which refers that population parameter will fall within set of…

Q: estimate the mean age of all students currently enrolled. In a random sample of 20 students the mean…

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Q: construct a 99% confidence interval for the true population mean textbook weight.

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Q: You measure 37 textbooks' weights, and find they have a mean weight of 59 ounces. Assume the…

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Q: In a survey, 18 people were asked how much they spent on their child's last birthday gift. The…

A: The summary of statistics is, x¯=30,s=16,n=18 The degree of freedom is, df=n-1   =18-1   =17…

Q: In a survey, 25 people were asked how much they spent on their child's last birthday gift. The…

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Q: You measure 20 dogs' weights, and find they have a mean weight of 44 ounces. Assume the population…

A: Since we know population standard deviation, use z-distribution to find z-critical value. Find…

Q: If n 28, = 37, and s = 6.2, construct a confidence interval at a 97% confidence level. Assume the…

A: Solution: The following information is given to us: s=6.2 n =28 A 97% confidence interval is…

Q: In a survey, 19 people were asked how much they spent on their child's last birthday gift. The…

A: From the provided information, Sample size (n) = 19 Sample mean (x̄) = $46 Sample standard deviation…

Q: You measure 50 textbooks' weights, and find they have a mean weight of 66 ounces. Assume the…

A: From the provided information, Sample size (n) = 50 Sample mean (x̅) = 66 ounces Population standard…

Q: You measure 37 dogs' weights, and find they have a mean weight of 35 ounces. Assume the population…

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Q: A poll asked for people's opinion on whether closing local newspapers would hurt civic life. 425 of…

A: We have given that, Favorable cases (X) = 425 and sample size (N) = 1002  Then,  We will fins the…

Q: Please answer math question

A: Solution: Let X be the diet lost. From the given information, n=42, x-bar=7.2 kg, S=3.9 kg and the…

Q: 4. The Department of the Treasury is interested in finding out what proportion of people support…

A: Note: According to Bartleby guidelines expert solve only one first question and rest can be…

Q: ou measure 50 textbooks' weights, and find they have a mean weight of 79 ounces. Assume the…

A: We have given that,  Sample mean (x̄) = 79, population standard deviation (σ) = 12.4 and sample size…

Q: A toy manufacturer wants to know how many new toys children buy each year. A sample of 242 children…

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Q: What changes the width of a confidence interval? A marketing director wants a 95% confidence…

A: As we all know that confidence interval is the range of values and it contains the true population…

Q: A local health clinic surveys 50 patients about their water drinking habits. It found the data is…

A: n=50 Mean=62 Standard deviation=5.2 Confidence level=95%

Q: Construct a 90% confidence interval for the mean when x̅=50 and there are 31 observations. Suppose…

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Q: You measure 49 dogs' weights, and find they have a mean weight of 72 ounces. Assume the population…

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Q: Montana plays basketball. He makes free throw shots 40% of the time. Montana must now attempt two…

A: The probability of making free throw shots is 0.40 and the probability of making the second free…

Q: You measure 43 dogs' weights, and find they have a mean weight of 34 ounces. Assume the population…

A: The objective of this question is to construct a 95% confidence interval for the true population…