From a long series of annual river flows, the variance is found to be 49 units. This can be treated as the population  variance. However, a new sample of 25 years has yielded a value  2 s ˆ = 81 units. Estimate the lower and upper

Q: rainfall average. Based on the study, in Parit Raja, the rainfall average is 4.93 cm with standard…

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Q: A sample of n=38n=38 data values randomly selected from a normally distributed population has…

A: Given  n=38, s=20.6, alpha=0.01 We want to find 99% CI for population variance

Q: In a recent study, the average number of times a person checks their phone every day is 96, with a…

A: Given Average=mean=96, median=90, mode=80 Variance=348.2 and range=269. We want 1) Shape of…

Q: Find a 95 percent confidence interval for the difference between means, where n 1 = 50, n 2 = 36,  X…

A: The (1-α)% confidence interval for the difference between means is given by (assuming unequal…

Q: A sample of n=45n=45 data values randomly selected from a normally distributed population has…

A: Excel function to find chi-square critical values. "=CHIINV( probability , df ) " This function…

Q: The electric cooperative needs to know the mean household usage of electricity by its non-commercial…

A: Population variance is 5.29. The z-critical value for 80% confidence interval is 1.2816 using the…

Q: To study the water PH level, two independent lakes were selected for sampling. In a duration of one…

A: Given Information : To study the water PH level , two independent lakes were selected for sampling .…

Q: A simple random sample of 21 people with early-onset dementia have the mean age at diagnosis of 52.3…

A: The random variable age is normally distributed. We have to test whether the mean age at diagnosis…

Q: Construct a 90% confidence interval for H₁-H2 with the sample statistics for mean cholesterol…

A: Given Data:For Sample 1:Sample size, n₁ = 18Sample mean, x̄₁ = 99Sample standard deviation, s₁ =…

Q: he lifetimes in hours of two brands of batteries follow normal distributions with means μX ,μY…

A: Given : The lifetimes in hours of two brands of batteries follow normal distributions with means μX…

Q: A random sample of daily high temperatures in January and February are listed. At an alpha equal to…

A: The objective of this question is to determine if there is a significant difference in the variances…

Q: The average length of time it takes to read a book can differ from one generation to another.…

A: Population standard deviation ()= 2.2population mean ()= 17sample mean  = 16.1sample size (n) = 50It…

Q: a. Express the original claim in symbolic form. Let the parameter represent the adults that would…

A: Claim: A minority of adults would erase all of their personal information online if they could. A…

Q: An automotive part must be machined to close tolerances to be acceptable to customers. Production…

A: The sample size is 32.

Q: The electric cooperative needs to know the mean household usage of electricity by its non-commercial…

A: Givenmargin of error(E)=0.09Variance(σ2)=1.96standard deviation(σ)=1.96=1.4confidence level=80%

Q: 5. An experiment was conducted to compare the vinegar content of salad dressing on two different…

A: Given: Sample size = n1 = n2  = 10 Sample variance s12=2.0 Sample variance s22=0.4 Confidence level…

Q: A professor measured her own blood pressure 25 times and found the sample mean to be 128.52, and…

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Q: A sample of n=46n=46 data values randomly selected from a normally distributed population has…

A: Critical values: By using the chi square table, the critical values at 1% level of significance are

Q: Assuming that the populations are normally distributed and the population standard deviations are…

A: A researcher is interested in comparing the resting pulse rate of people who exercise regularly and…

Q: A random sample of 24 ages of students at a college yielded a mean of 20.9 years and a standard…

A: From the provided information, Sample size (n) = 24 Sample mean (x̄) = 20.9 Standard deviation (s) =…

Q: Construct a 99% confidence interval for H1 H2 with the sample statistics for mean cholesterol…

A: Constructing a confidence interval involves several steps to estimate a population parameter, such…

Q: Recent research indicates that a labor force with average education less than 12 years is…

A: The objective of the question is to determine whether the average years of education among…

Q: A study of life expectancy showed that a random of 6 states had a standard devotion of 0.8 deaths…

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Q: A sample of n=30n=30 data values randomly selected from a normally distributed population has…

A: We have tonfinf  a 99% confidence interval for the population variance.

Q: We wish to give a 95% confidence interval for the mean time it takes to complete a routine assembly…

A: Point estimate of the population average is the sample average. That is, the population average is…

Q: You would like to estimate the variance of GPA’s at SDSU.  You randomly select 14 students and get a…

A: From the provided information, Sample size (n) = 14 Sample standard deviation (s) = 0.981 Confidence…

Q: The pH of rain, measured at a weather station in Michigan, was observed for 39 consecutive rain…

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Q: Suppose the mean income of firms in the industry for a year is $25 million with a standard deviation…

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