9. A particular brand of coffee contains an average of 112 mg of caffeine per cup with a standard deviation of 20 mg. You want to investigate the same to estimate if the true population mean of caffeine content is correct within 5 mg adopting 98% confidence. How many cups of the same brand of coffee should you have for your sample?

Q: Assume that a normal distribution of data has a mean of 16 and a standard deviation of 3. Use the…

A: It is provided that the data follows the normal distribution with mean , and standard deviation is…

Q: A particular fruit's weights are normally distributed, with a mean of 527 grams and a standard…

A: Given Mean=527 Standard deviations=5

Q: The means of two single large samples of 1200 and 2300 members are 76.5 inches and 86 inches…

A:

Q: Suppose that the weights of candy bars vary according to a normal distribution, with mean of 62…

A: The question is about normal dist. Given : The mean weights of candy bars ( μ ) = 62 g The std.…

Q: what percent of the data falls within 2 standard deviations of the mean?

A:

Q: Assume that the number of pieces per bag has a mean of 264 with a standard deviation of 3. use the…

A: Given :  the number of pieces per bag has a mean of , μ=264  a standard deviation of , σ =3   We…

Q: A particular fruit's weights are normally distributed, with a mean of 497 grams 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 mean and standard deviation of hemoglobin level of 23 vibrant students and 21 school children…

A: We have to test claim.

Q: The height of trees in a nursery is normally distributed with a mean of 56.4 inches and a standard…

A: The height of trees in a nursery is normally distributed with a mean of 56.4 inches and a standard…

Q: If the main level of snowfall for Boston Massachusetts is 44 inches per year and the standard…

A:

Q: Approximately what percentage of normally distributed data values will fall within 2 standard…

A: It is known that, normal curve is a symmetric and bell shaped distribution.

Q: scores are normally distributed with mean 500 and standard deviation 100. Julie scores 650. Her…

A: Consider X be the random variable representing the SAT scores. X follows normal distribution with…

Q: The weights of tablets are normally distributed with mean 254 mg and standard deviation 4 mg.  What…

A:

Q: Assume the cholesterol levels of adult American women can be described by a Normal model with a mean…

A: According to the given information, we have Mean = 188 mg/dL Standard deviation = 24 mg/dL

Q: The mean rate for cable t.v.from a sample of 80 households was $29 per month with a standard…

A:

Q: A particular fruit's weights are normally distributed, with a mean of 583 grams and a standard…

A: To find: The heaviest 15% of fruits weigh more than how many grams?

Q: The time taken to boil a kettle is normally  distributed with a mean of 94 seconds and  a standard…

A: The provided information is  µ=94 σ=6 P(-a<X<a)=0.40…

Q: The weights of tablets are normally distributed with mean 254 mg and standard deviation 4 mg.  What…

A: We have given , Mean(u) = 254 mg. Standard deviation (sigma) = 4 mg. We have to find  What…

Q: lies

A: Let X be the random variable such that the  daily water usage per person in Quezon City. The daily…

Q: The life span of a brand of tireis normally di stributed with a mean of 50,000 miles and a standard…

A:

Q: A particular fruit's weights are normally distributed, with a mean of 361 grams and a standard…

A: From the provided information,

Q: Answer the multiple choice. A sample of size 50 will be drawn from a population with mean 73 and…

A:

Q: What proportion of people has diastolic blood pressure less than 80?

A:

Q: lab supply company sells pieces of Douglas fir 6 inches long and 2.5 inches square for force…

A: From the given information, Population standard deviation=3500 Margin of Error=700 Confidence level…

Q: A particular fruit's weights are normally distributed, with a mean of 464 grams and a standard…

A: Let "x" be the weight of the fruit in grams. Sketch the normal curve and shade the area of 0.18…

Q: A particular fruit's weights are normally distributed, with a mean of 767 grams and a standard…

A: Given data,μ=767σ=39P(X>x)=0.11x=?

Q: The weights of men are normally with a mean of 172 pounds and a standard deviation of 29 pounds.…

A: Let X be the random variable from normal distribution with mean (μ) = 172 and standard deviation (σ)…

Q: A bank loan officer rates applicants for credit. The ratings can be described by a normal model with…

A: Given: μ = ​200 σ = 50

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Q: The width of an A4 piece of paper is  normally distributed with a mean of 210  mm and a standard…

A: The width of an A4 piece of paper is normally distributed with a mean of 210 mm and a standard…

Q: The mean of a data ser is 70. The standard deviation is 2. Between what Value is 95% of data found…

A:

Q: Americans love ice cream .The annual per capita consumption of ice cream ,in pounds ,in the united…

A: We have given that,  X be the random variable from normal distribution with mean (μ) = 16.5 and…

Q: 21 year old men rates at rest are normally distributed with a mean of 70 beats per minute, and a…

A: Given that   21 year old men rates at rest are normally distributed Mean (μ)=70 beats per minute…

Q: A particular fruit's weights are normally distributed, with a mean of 562 grams and a standard…

A: Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: particular fruit's weights are normally distributed, with a mean of 522 grams and a standard…

A: Here we find  The heaviest 11% of fruits weigh more than how many grams

Q: According to Our World in Data, male heights follow a normal distribution with µ =178.4 cm and o=…

A:

Q: A particular fruit's weights are normally distributed, with a mean of 477 grams and a standard…

A:

Q: Calculate z scores from two samples "he tallest living man at one time had a height of 252 cm. The…

A: Given data,Mean is μ=170.25sd is     σ=8.47

Q: Scientists find that a particular species of caterpillar has a mean mass of 32 grams with a standard…

A:

Q: A study reported on essential organic molecules and a Normal model can be used to describe these…

A: As per our guidelines we are suppose to answer three sub parts. Given,mean(μ)=194standard…

Q: The weights of tablets are normally distributed with mean 254 mg and standard deviation 4 mg.  If…

A: We have given that,  X be the random variable from normal distribution with mean (μ)= 254 and…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.