The mean time it takes for a random sample of 758 airplanes to fly from Florida to New York was shown to be 165 minutes, with a standard deviation of 45 minutes. Using a 95% confidence level, which one of the following null hypotheses will be rejected?   H0: μ = 162.8 mins H0: μ = 161.7 mins H0: μ = 167.9 mins H0: μ = 162.0 min

Q: An automobile rental agency has the following mileages (in thousands) for a simple random sample of…

A: Given; Sample standard deviation(s)=4.12 Sample size(n)=25 Level of significance (α)=0.1…

Q: Of the following, which is the smallest sample size that will result in a margin of error of 0.1…

A: It is given that Population SD = 1.5 Margin of error E = 0.1 Level of confidence = 99% The critical…

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

A:

Q: A sample of ?=25 diners at a local restaurant had a mean lunch bill of $16 with a standard deviation…

A: From the provided information, Sample size (n) = 25 Standard deviation (σ) = $5 Confidence level =…

Q: Which of the following would increase the width of a confidence interval for a population mean?

A:

Q: If the population standard deviation is known to be 4.7 hours, and a random sample of 35 analysts…

A: Given that Sample size n = 35 Sample mean = 50.5 Population SD = 4.7 The critical value of Z at 90%…

Q: According to Dietary Goals for the US (1977), high sodium intake may be related to ulcers, stomach…

A:

Q: A cell phone company claims that the average time a person spends on their phone is 12.8 hours a…

A: Given that, Population mean=μ=12.8 Hours Sample mean=X Bar=12.2 Hours Sample standard deviation= 2.3…

Q: A random sample of 24 used SUVs sold online on a popular website had an average price of $25,599…

A: Given information: n=24x¯=25,599s=3035 Confidence level=99%. Significance level=1% Degrees of…

Q: On the Standford-Binet test, the mean IQ is 100. A class of 21 kindergarten pupils were tested with…

A:

Q: A cell phone company claims that the average time a person spends on their phone is 12.8 hours a…

A: The provided information is: Sample meanx¯=12.20 Population standard deviationσ=2.30 Level of…

Q: Construct the indicated confidence interval for the difference between the two population means.…

A: We have given the amount of time spent watching television by women and by men- For sample 1 for…

Q: A random sample of 10 employees of a company was selected to estimate the mean one-way commute time…

A: From the provided information, Sample size (n) = 10 Sample mean (x̅) = 38 Sample standard deviation…

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Given : Margin of error = 5 α = 0.05 Population standard deviation = σ = 30 zα2 = z0.052 = 1.96

Q: Which of the following would result in a larger width for a confidence interval? A- use a larger…

A: Smaller sample size or large variability will have large width for a confidence interval.

Q: A local power utility claims that the mean annual household electric bill for its subscribers is…

A: Solution: a. Let X be the annual electric bill. From the given information, x-bar=648, σ=$150, n=25.

Q: In a hospital, a sample of 8 weeks was selected, and it was found that an average of 529 patients…

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Q: The bottlers of a new fruit juice daily select a random sample of 12 bottles of the drink to…

A:

Q: 3.In a random sample of 170 customers, 90 ordered chicken sandwitches for lunch. Construct a 94%…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: A weekly tabloid reported that the average income of its subscribers is $39,100. Assume this…

A:

Q: A pizza shop owner wishes to find the 99% confidence interval of the true mean cost of a large plain…

A: Given σ=0.14E=0.11n=?The z-value at 99% confidence is 2.58

Q: A random sample of 240 adults over the age of 40 found that 144 would use an online dating service.…

A:

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Given that, Confidence Interval = 95% Margin of error, M.E. = 4 Population Standard deviation, σ =…

Q: A random sample of 16 lightbulbs of one brand was selected to estimate the mean lifetime of that…

A: We have given that,  Sample mean (x̄) = 1025, standard deviation (s) = 130 and sample size (n) = 16…

Q: A random sample of 10 employees of a company was selected to estimate the mean one-way commute time…

A: Given Information :  A random sample of 10 employees of a company was selected to estimate the mean…

Q: What is the upper bound of the 95% confidence interval of the mean sodium content of the noodles…

A: It is given that Sample size n = 9 Sample mean M = 226 Sample SD s = 8.2 The critical value of t at…

Q: A random sample of 100 packs of apples with a professed weight of 1kg was found to have mear 1020g…

A: Consider X as the random variable that indicates the weight of an apple. The provided information is…

Q: Find the length of a 99% confidence interval for the mean of the sample with a standard deviation of…

A: We have given that the 99% confidence interval for the mean of the sample with a standard deviation…

Q: that the scores have a standard deviation of 9. A psych Construct a 95% confidence interval for the…

A: An Existing inventory for a test measuring self-esteemσ=9 indicates that the scores have a standard…

Q: According to Dietary Goals for the US (1977), high sodium intake may be related to ulcers, stomach…

A: We have given that  Sample size n =9 Sample mean =214 Standard deviation =7.5

Q: Ten years after graduation, the salaries of Heriot-Watt University graduates are Normally…

A: Let X ~ Normal( 55000, 11000)

Q: A sample of 15 items provides a sample mean of 18 and a sample variance of 16. Compute a 95%…

A: The known values are, The degree of freedom is, Critical values: By using the chi square table,…

Q: The mean time it takes for a random sample of 758 airplanes to fly from Florida to New York was…

A: airplanes to fly from Florida to New York μ=165  standard deviation σ=45 The mean time n=758…

Q: In an effort to estimate the mean dollars spent per visit by customers of a food store, the manager…

A: Given: s = $12.30  n = 100

Q: A quality control expert at a pretzel factory took a random sample of 10 bags from a production run…

A:

Q: How large a sample should be selected to provide a 99% confidence interval with a margin of error of…

A:

Q: Two sets of chromium analyses were performed on water samples from a stream that runs near a…

A: Given: Two sets of chromium analyses were performed on water samples from a stream that runs near a…

Q: Find the error bound for an unknown population mean or the margin of error that corresponds to a 85%…

A: Find the error bound for an unknown population mean or the margin of error that corresponds to a 85%…

Q: average expenditure per student (based on average daily attendance) for a certain school year was…

A: Define the Null and alternative hypotheses:   Null Hypothesis:    H0: µ = 10,337.   Alternate…

Q: Find the 95% confidence interval for the variance and standard deviation of the heights of maple…

A: Construct the 95% confidence interval for the variance. Obtain the critical values. The standard…

Q: A candy company claims that their bags of jellybeans have a mear weight of 9.45 oz. 125 randomly…

A: Given Data: x¯=9.68s=1.23n=125   Null and Alternate Hypothesis: H0: μ=9.45HA: μ≠9.45

Q: Construct a 90% confidence interval for the true average cost of a 75 000 kilometre car service in…

A:

Q: Given that you have a sample size of 10 different soda pops, with a sample mean of 2.228 and a…

A: The provided information are:

Q: In a recent study of 42 eighth graders, the mean number of hours per week that they watched…

A: We are required to estimate the interval for the TV watching hours per week from the given sample of…

Q: In a random sample of 23 cars brought in for repairs, the mean cost of repairs was $349.00, with a…

A: Sample mean = x̅ = 349 Sample size = n = 23 Sample S.D = s = 38 Standard Error = s/√n  =…

Q: How much do students pay, on the average, for textbooks during the first semester of college? From a…

A: Margin of Error (MoR): It is the Range of values that has the sample statistics in the confidence…

Q: In a sample of 100 steel canisters, the mean wall thickness was 8.1 mm with a standard deviation of…

A:

Q: Sixty-four randomly selected adults who buy books for general reading were asked how much they…

A: From the provided information, Sample size (n) = 64 Sample mean (x̄) = 1450 Standard deviation (s) =…

Q: The average weight of 35 randomly selected compact automobiles was 2680 pounds. The sample standard…

A: From the provided information, Sample size (n) = 61 Sample mean (x̅) = 2680 Sample standard…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.