Two kinds of thread are being compared for strength. Fifty pieces of each type of thread are tested under similar conditions. Brand A had an average: tensile strength of 78.3 kilograms with a standard deviation of 5.6 kilograms, while brand B had an average tensile strength of 87.2 kilograms with a standard deviation of 6.3 kilograms

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A: Given,sample size(n)=90sample mean(x¯)=15.61population standard…

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Q: You measure 21 watermelons' weights, and find they have a mean weight of 47 ounces. Assume the…

A: sample size (n)=21Mean()=47standard deviation()=5.6confidence level=90%

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Q: Evaluate E=z P₁ 91 P2 92 1₂ n₁ ==(Round to four decimal places as needed.) for z = 1.96, x₁ = 36, x₂…

A: Given that  Sample sizes n1=41 , n2=115 Favorable cases x1=36 ,x2=99 Z*=1.96

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A: Given information is :n=50x=$248.47S=$27.43And also given that 95% confidence interval is…

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A: Given that, mean , μ=76.5standard deviation,σ=19.1and sample mean(class-average),x =68.4 and sample…

Q: A recent survey of 6 social networking sites has a mean of 15.9 million visitors for a specific…

A: Given Data: Sample mean (x )=15.9 Standard deviation (sd)=3.3 n=6   We know that x-μsd/n~ tn-1

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A:

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A: Sample size (n) = 35 Sample mean(x̅) = 40 Population standard deviation(σ) = 7.8 Confidence interval…

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A: Given Data: x1=33         x2=28n1=70         n2=67s1=3.2        s2=2.6    Calculating the pooled…

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A: We have given that, Sample mean (x̄) = 72, population standard deviation (σ) = 11.7 and sample size…

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A: Sample mean = x̅ = 34 Sample size = n = 30 Population S.D = σ = 11.3

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A: Mean weight =64 ouncesStandard deviation=4 ounces99% confidence interval i.e. 1% level of…

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Q: You measure 38 textbook's weights, and find they have a mean weight of 78 ounces. Assume the…

A: Answer: Using the given data, Sample size (n) = 38 Sample mean x¯ = 78 Population standard deviation…

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A: As the population standard deviation is not known, we will use t distribution.Degrees of freedom are…

Q: You measure 41 backpacks' weights, and find they have a mean weight of 50 ounces. Assume the…

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

Q: A study of working actors looked at age and gender. One sample of 70 male actors had a mean age of…

A: Given information: X¯1=33 yearsX¯2=28 yearss1=3.2 yearss2=2.6 yearsn1=70n2=67   The condition for…

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A: We need to construct the 99%99\%99% confidence interval for the population mean μ\muμ. The following…

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A: It is given that, There is a random sample of size 52 and has a mean of 49.7 and the standard…

Q: You measure 39 backpacks' weights, and find they have a mean weight of 71 ounces. Assume the…

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

Q: One year, the mean age of an inmate on death row was 40 6 years. A sociologist wondered whether the…

A: Given: μ = 40.6 x¯ =38.9 s = 8.4  n = 32

Q: You measure 23 watermelons' weights, and find they have a mean weight of 70 ounces. Assume the…

A: Given Information: Sample mean ( x) = 70 Sample size (n) = 23 Population standard deviation (σ) =…

Q: You measure 25 textbooks' weights, and find they have a mean weight of 42 ounces. Assume the…

A: Given information: n=25x¯=42σ=5 Confidence level is 90% Significance level is 10%. From the z tale,…

Q: On average, the level of radioactivity was 198.2 gammas. The standard deviation was 3.3 gammas.…

A: Given information Sample size n = 10 Sample mean x̅ = 200 Population standard deviation = 3.3…

Q: Pumpkins from a local farmer have a mean weight of 16 pounds with a standard deviation of 2.5…

A: Given information: It is given that, Pumpkins from a local farmer have a mean weight of µ = 16…

Q: A random sample of 30 words from Jane Austen's Pride and Prejudice had a mean length of 4.08 letters…

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A: A confidence interval is a type of estimate computed from the statistics of the observed data. This…

Q: You measure 40 turtles' weights, and find they have a mean weight of 71 ounces. Assume the…

A: Givensample size(n)=40Mean(x)=71standard deviation(σ)=5.1confidence level=99%

Q: One year, the mean age of an inmate on death row was 38.3 years. A sociologist wondered whether the…

A: Suppose  is the population mean age of an inmate on death row.

Q: One year, the mean age of an inmate on death row was 40.1 years. A sociologist wondered whether the…

A: Let μ and σ denote respectively the population mean and standard deviation of age of death-row…

Q: One year, the mean age of an inmate on death row was 40.9 years. A sociologist wondered whether the…

A: