The operations manager at a light emitting diode (LED) light bulb factory needs to estimate the mean life of a large shipment of LEDs. The manufacturer’s specifications are that the standard deviation is 1,500 hours. A random sample of 64 LEDs indicated a sample mean life of 49,875 hours. Construct a 95% confidence interval estimate for the population mean life of LED light bulbs in this shipment.

Q: Humerus bones from the same species of animal have approximately the same length-to-width ratios. It…

A: Solution: Given information: n= 100 Sample size  x= 5.6 Sample mean s= 0.25 Sample standard…

Q: If a population has a standard deviation σ of 36 units, what is the standard error of the mean if…

A: The population standard deviation is 36.

Q: Suppose a small paint manufacturing company has a daily production that is normally distributed with…

A: Solution: It is given that a small paint manufacturing company has a daily production that is…

Q: assuming that adults have IQ scores that are normally distributed with a mean of 102.4 and a…

A: Introduction: Denote X as the IQ score of a randomly selected adult. It is given that X has a normal…

Q: The life of a 9-volt battery is normally distributed with a mean of l = 2000 hours and a standard…

A:

Q: Samples of size 5 are selected from a manufacturing process. The mean of the sample ranges is .50.…

A: Explanation:Here given the sample size and mean range values  Then find the population of the…

Q: Ten oil tins are taken at random from an automatic filing machine. The mean weight of the 10 tins is…

A:

Q: The nails produced by a machine are assumed to have a mean of 5.0 cm. A random sample of 80 nails…

A: Null hypothesis: H0: µ=5. Alternative hypothesis: H1:µ>5. This is a right tailed test. Here, the…

Q: umerus bones from the same species of animal have approximately the same length-to-width ratios. It…

A:

Q: State the null and alternative hypotheses. Using α = 0.01 level of significance, what is your…

A: 1. Let μ denotes the mean credit card balance for undergraduate students. The claim of the test is…

Q: If the population standard deviation is 1.3, then Find the standard deviation of x for an SRS of…

A: Answer: From the given data, Population standard deviation(σ) = 1.3 Number of observation(n) = 82

Q: A particular fruit's weights are normally distributed, with a mean of 305 grams and a standard…

A: Given: Formula: Let "X" be the weight of fruits in grams.

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.5 and a standard…

A: Solution: Let X be the adults IQ score has normally distributed with mean μ=100.5 and standard…

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

A:

Q: The average retirement age in the US is about 63 years with a standard deviation of 1 year. In one…

A: Xbar1=63 , Standard deviation=sigma1=1 Xbar2=62 , Standard deviation=sigma2=0.5

Q: oretta, who turns  91  this year, has heard that the mean systolic blood pressure among the elderly…

A: Given: Sample size (n)= 19 Sample mean x¯=130 Sample standard deviation (s) = 20 Hypothesized mean…

Q: Wall thickness of 25 glass 2-liter bottles was measured by a quality-control engineer. The sample…

A: Given that  Sample Mean \bar XXˉ = 4.104.10 Sample Standard Deviation (s)(s) = 0.080.08…

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: Suppose that the antenna lengths of woodlice are approximately normally distributed with a mean of…

A: Given data: Mean = 0.22 inches Standard deviation  = .05 inches To find: What proportion of woodlice…

Q: and II error (in words). Analyze the scenario and formulate situations where type I and type II…

A: Given: Sample size = 100 Sample standard deviation = 6 Sample mean = 160 Hypothesized mean = 158.2

Q: 2. The ages of the 189 people were recorded in a clinical study. The data have been partially…

A: The given data is as follows,…

Q: In a sample of 134 ball bearings, the average diameter was found to be 3.78mm with a standard…

A: The sample size of ball bearings, The mean diameter,  mmThe standard deviation, A point estimate for…

Q: Condé Nast Traveler conducts an annual survey in which readers rate their favorite cruise ship. All…

A: given, Group1: The ships carry 500 passengers Sample size n1=37 Sample average rating x¯1=85.39…

Q: A company manufactures LED light bulbs. The lifetime for these bulbs is 4,100 hours with a standard…

A:

Q: If the population standard deviation is 6.8, then Find the standard deviation of x for an SRS of 64…

A: Answer: From the given data, Population standard deviation σ = 6.8 Sample size (n) = 64

Q: Suppose that another sample of resting heart rates for five Math students was obtained: 72, 68, 66,…

A: From the given data we want to know the data value .

Q: e diameters of Douglas firs grown at a Christmas Tree Farm are normally distributed with a mean of 4…

A: GIVEN DATA, normal distributionμ=4σ=1.5we have to find out the given probabilities.

Q: fitness center is interested in finding a 95% CI for the mean number of days per week that Americans…

A: Given: Xˉ=3.2 s=2.6 n=248  Confidence level = 95% As the population standard deviation is not known,…

Q: a life time of a certain brand of tires is approximately normally distributed with a mean of 42,500…

A: Given information- Population mean, µ = 42,500 miles Population standard deviation, σ = 3200 miles…

Q: In 1970, adults who were 18 years or more had a mean systolic blood pressure (SBP) of 148 mm Hg.,…

A: Given that in 1970 adults who were 18 years or more had a mean systolic blood pressure (SBP) of 148…

Q: If a sample of 144 male weights has a mean of 266 pounds and standard deviation of 32 pounds. The CV…

A: Given data Mean (x̅ ) = 266Standard deviation (s) = 32Coefficient of variation(CV) for sample is…

Q: What is the test statistic for this procedure?

A: Assume that all conditions are met. The mean of the differences was 1.33 and the standard deviation…

Q: The​ quality-control manager at a compact fluorescent light bulb​ (CFL) factory needs to determine…

A: The population standard deviation is 92 hours.

Q: in a population of Yorkshire hogs, sample statistics indicate the following: Average Days to 250…

A: The question is about normal distribution.Given :Population average days (  ) = 160Population…

Q: Suppose that the antenna lengths of woodlice are approximately normally distributed with a mean of…

A: Given,mean(μ)=0.25standard deviation(σ)=0.05

Q: he seasonal output of a new experimental strain of pepper plants was carefully weighed. The mean…

A: normal distribution ,μ=17σ=1.75n=200p(13<X<16)=?

Q: The ages of students in a certain high school had mean 16.5 and standard deviation 1.2. A student…

A:

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

A:

Q: According to the World Health Organization, the average height of a one-year-old child is 29". You…

A: The test statistic is -4.4721 and the p-value is 0.00013.