Find a 99% confidence interval for weights of newborn chimpanzees at the zoo. The sample has 215 babies, with a mean weight of 33.8 hg, and a standard deviation of 6.6 hg.  What is the lower limit What is the upper limit

Q: A ski gondola carries to the top of a mountain. Assume that the weights of skiers are normally…

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Q: The mean value of the 130 observation is 17 with standard deviation deviation equal to 0.98. Find…

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Q: A sample of 60 people who were chosen for a sample had an average IQ score of 105. If the population…

A: From the given, x¯ (mean IQ score from sample)=105n (sample size)=60σ (population SD of IQ…

Q: Among 157 Hispanic American men ,the mean systolic blood pressure was 146 mm Hg with a standard…

A: Hypotheses: Null hypothesis: H0: µ = 140. Alternative hypothesis: H1: µ >140. Here, the…

Q: Find a 90% confidence interval for the population mean, if the sample size is 58, the sample mean is…

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Q: The standard deviation of the weights of elephants is known to be approximately 15 pounds.  We wish…

A: Sample mean = x̅ = 244 Sample size = n = 50 Population S.D = σ = 15 Standard Error = σ/√n  =…

Q: The mean pulse rate of an adult female is 72. A random sample of 217 adult females gives a sample…

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Q: population has a standard deviation of 18 on average how much difference should exist between the…

A: A population has a standard deviation of 18.

Q: The average weight of 36 randomly selected school buses was 4150 pounds with a standard deviation of…

A: Given data,x=4150σ=480n=36z-value at 99% confidence is Zc=2.576

Q: use this to find a 95% confidence interval for the mean height of all red maple trees

A: The sample size is n = 146 Sample mean = 59 And sample SD = 12 Since the sample size is large then…

Q: A sample of 13 concerts showed their average noise levels were 82 decibels and their standard…

A: Solution: Let X be the noise level From the given information, x-bar=82 decibels, s=7 decibels and…

Q: Find the Confidence interval for the true Population Mean if a sample of 50 has a mean of 26.8 and a…

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Q: To determine whether a new drug designed to lower a person’s heart rate is effective or not, Dr.…

A: Since sample size is large and population standard deviation is known, z-test is appropriate in this…

Q: The shelf life of a battery produ wd by one major company is known to be Normally distributed, with…

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Q: The life of sunshine CD players is normally distributed with mean of 4.9 years and a standard…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: The population distribution of the useful lifetime of a cutting blade of a concrete saw has mean 50…

A: From the provided information, Population mean (µ) = 50 hours Standard deviation (σ) = 9 hours Let X…

Q: The average weight loss at a clinic is 10lbs with a standard deviation of 5lbs. What is the chance…

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Q: A large number of chain saws have been sold. You contact 250 customers and find that it takes an…

A: The following information is provided: Sample Mean \bar XXˉ = 4242 Sample Standard Deviation…

Q: The age when smokers first start from previous studies is normally distributed with a mean of 13…

A: Given,sample size(n)=22sample mean(x¯)=13.8standard deviation(σ)=2.1α=1-0.90=0.1α2=0.05Z0.05=1.645…

Q: Suppose the mean blood glucose of a population of adults is 162 with a standard deviation of 58.…

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Q: A recent survey of 8 social network sites has a mean of 13.1 million visitors for a specific month.…

A: Given that, Mean = 13.1 Standard deviation = 3.1 Sample size = 8

Q: A researcher takes a sample of 25 people and calculates a 90% confidence interval of (4,24) for a…

A: The confidence interval is (4,24).

Q: 95% confidence interval of the population mean

A: Given : Sample Size, n = 40 Sample Mean, x̄ = 500 sample standard…

Q: sample of 37 inchworms in Cititon Park was collected and measured. Their lengths had a mean of 2.56…

A: Given:  Sample size n=37  Sample mean(xbar) x¯ =2.56  Standard deviation( ?)=0.09  To find 95%…

Q: A random sample of 5 months in an urban area showed an average of 28 mail carriers were bitten by…

A: Here we need to construct a 95% confidence interval for the mean number of mail carriers who were…

Q: random sample of 36 people in Edirne city was asked how much their monthly income was. The sample…

A: Given: Sample size (n) = 36 Sample standard deviation (s) = 1200 Sample mean x¯=16000 Confidence…

Q: Find the 90% confidence interval for the standard deviation of the lengths of pipes if a sample of…

A: given data s = 10.2 n = 22 90% CI for σ = ? α = 1 - 0.90 = 0.10df = n - 1 = 21χ2L = χ21-α2,n-1…

Q: A firm is looking to employ a person as an engineer. Applicants of earlier years have standart…

A: Obtain the 90% confidence interval for the mean of all applicants exam results The 90% confidence…

Q: The mean diastolic blood pressure for a random sample of 70 people was 96 millimeters of mercury.…

A: given data  n = 70 x¯ = 96σ = 1190% ci for μ.

Q: A random sample of 250 students at a university finds that these students take a mean of 15 credit…

A: Solution: From the given information, the 99% confidence interval for the mean credit hours is…

Q: 20 TV remote controls were followed over the years to find the mean lifespan of this model. The…

A: Answer - Here  n = 20 TV remote controls were followed  over the years to find the mean…

Q: The mean number of English courses taken in a two-year time period by male and female college…

A: Given: The mean number of English courses taken in a two-year time period by male and female college…

Q: The mean score of a class of 30 students in their math test is 6.267. The standard deviation is 1.9…

A: The null and alternative hypothesis is, The given 95% confidence interval for population mean is,…

Q: A large number of bags of cement have been manufactured. You sample 10 of the bags and find that…

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Q: The weight of male athletes is normally distributed with a mean of 95 kg and a standard deviation of…

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