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

Q: A geologist examine 16 seawater samples for mercury concentration. The main mercury concentration…

A:

Q: You measure 20 backpacks' weights, and find they have a mean weight of 76 ounces. Assume the…

A: sample size (n)=20Mean ()=76standard deviation ()=9.6confidence level=99%

Q: population mean turtle weight. r answers as decimals, to two places ounces

A: Since population standard deviation is known, the critical value at 99% confidence value will be…

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%

Q: You measure 41 randomly selected textbooks' weights, and find they have a mean weight of 69 ounces.…

A:

Q: T randomly selected 50 text books and found their mean cost to be $248.47 with a standard deviation…

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

Q: Find a 95% two-sided confidence interval on the true mean breaking strength. Round the answers to 1…

A: Given : n=11 , X-bar=92  , σ=3  , α=0.05 Since , the population standard deviation (σ) is known.…

Q: You measure 23 turtles' weights, and find they have a mean weight of 71 ounces. Assume the popula…

A: Given that  Sample size n =23 Sample mean =71 Population standard deviation =11.3

Q: An important factor in selling a residential property is the number of people who look through the…

A: Since the sample size is small and population standard deviation is unknown, t distribution can be…

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

Q: You measure 44 textbook's weights, and find they have a mean weight of 81 ounces. Assume the…

A: Answer: From the given data, Sample size(n) = 44 Mean (x¯) = 81 Standard deviation (σ) = 3.8 95%…

Q: You measure 25 turtles' weights, and find they have a mean weight of 45 ounces. Assume the…

A: The random variable turtle’s weight follows normal distribution. The sample size is 25. The sample…

Q: You measure 41 watermelons' weights, and find they have a mean weight of 65 ounces. Assume the…

A: Introduction: The 100 (1 – α) % confidence interval for the population mean, μ, when the population…

Q: You measure 35 backpacks' weights, and find they have a mean weight of 40 ounces. Assume the…

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

Q: A meteorologist who sampled 10 thunderstorms found that the average speed at which they traveled…

A:

Q: Abbot Milk Company conduct a study about child growth and the relationship with milk consumption…

A: The claim is μ≠91.4 So, the null and alternative hypotheses are H0:μ=91.4H1:μ≠91.4 Given that…

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

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

Q: You measure 43 backpacks' weights, and find they have a mean weight of 72 ounces. Assume the…

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

Q: You measure 30 watermelons' weights, and find they have a mean weight of 34 ounces. Assume the…

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

Q: You measure 35 backpacks' weights, and find they have a mean weight of 64 ounces. Assume the…

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

Q: You measure 21 dogs' weights, and find they have a mean weight of 37 ounces. Assume the population…

A:

Q: e chips per cookie for Big Chip cookies? Round your answers to one decimal place.

A: Let X be the random variable such that number of chocolate chips per cookie for Big Chip cookies x̅:…

Q: Michelle takes a sample of 25 different-gender married couples. In her sample, she found that the…

A:

Q: what is the maximal margin of error associated

A: You measure 26 watermelons' weights, and find they have a mean weight of 31 ounces. Assume the…

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…

Q: vey of 9 social networking sites has a mean of 13.74 million visitors for a specific month. The…

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…

Q: You measure 45 turtles' weights, and find they have a mean weight of 62 ounces. Assume the…

A:

Q: You measure 28 backpacks' weights, and find they have a mean weight of 52 ounces. Assume the…

A:

Q: You measure 30 backpacks' weights, and find they have a mean weight of 78 ounces. Assume the…

A:

Q: You measure 48 backpacks' weights, and find they have a mean weight of 71 ounces. Assume the…

A:

Q: Find a 90% confidence interval for the population mean age of the Smurfs if a sample of 52 smurfs…

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: You measure 39 turtles' weights, and find they have a mean weight of 30 ounces. Assume the…

A: The mean is 30 and the population standard deviation is 7.8.

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 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: