The mean and standard deviation of system blood pressure of 200 employees in a factory were 127mmhg and 13 mmHg respectively. Calculate and interprete the 95% confidence interval of systolic blood pressure of the employees

Q: A drug company is working on a drug manufacturing process and estimates the daily approximate drug…

A:

Q: A researcher would like to estimate the mean weight of all adult male American alligators in the…

A: Givensample size(n)=80Mean(x)=522standard deviation(σ)=25Confidence level=96%

Q: A random sample of 21 Camden County College students had a mean age of 24 years, with a standard…

A:

Q: According to the National Health Statistics Reports, the standard deviation of the weights of all…

A:

Q: A study of 40 bowlers showed that their average score was 180. The standard deviation of the…

A: Given n=sample size=40 x¯=sample mean=180 σ=population standard deviation=6 confidence level=0.95…

Q: The combined SAT scores for the students at a local high school are normally distributed with a mean…

A: Mean = 1516 Standard deviation = 309

Q: A sample of 22 public high school students spent an average of 6.5 hours studying per week. Assume…

A:

Q: A researcher would like to estimate the mean weight of all adult male American alligators in the…

A: Sample size (n) = 105Sample mean (x̅) = 502Standard deviations (σ) = 29Significance level (α) = 1 -…

Q: The number of motorcycle sold annually by salespeople is normally distributed with a standard…

A:

Q: The heights of a random sample of 20 college students showed a mean of 174.5 centimeter: and a…

A: As the population standard deviation is not known, we will use t distribution. The number of degrees…

Q: The heights of a random sample of 20 college students showed a mean of 174.5 centimeters and a…

A: It is an important part of statistics. It is widely used.

Q: The sample mean weight of 100 chimpanzees was measured to be 82.4 pounds, with a standard deviation…

A:

Q: An engineer is determining if the bolts she designed are being manufactured with accurate…

A: The sample mean is 42 mm and the standard deviation is 2 mm.

Q: The average weight of 36 randomly selected school buses was 4150 pounds with a standard deviation of…

A: Given data,x=4150σ=480n=36z-value at 99% confidence is Zc=2.576

Q: A study of a local high school tried to determine the mean number of text messages that each student…

A:

Q: The lead levels in a random sample of 35 crows in the region were measured and recorded. The mean…

A:

Q: The weight of a certain machined part has a standard deviation of 4 grams. How many parts from the…

A: Given information- Standard deviation, σ = 4 grams Confidence level = 0.95 n = sample size Margin…

Q: A researcher is interested in estimating the mean length of walleye in a lake with a 95% confidence…

A:

Q: An investigator wants to estimate caffeine consumption in high school students. How many students…

A:

Q: The mean score of a competency test is 73​, with a standard deviation of 4. Use the empirical rule…

A: Given: According to empirical rule

Q: A drug company is working on a drug manufacturing process and estimates the daily approximate drug…

A: given that,sample mean, x =892standard deviation, s =27sample size, n =81

Q: A sample of 25 two-year-old chickens shows that they lay an average of 21 eggs per month. The…

A: Given, Sample size, n=25 mean, x =21 standard deviation, s=2   Formula for confidence interval( CI )…

Q: A researcher has collected the blood samples of 29 individuals and found that the mean hemoglobin…

A: Given information :  A researcher has collected the blood samples of 29 individuals and found that…

Q: The heights of a random sample of 50 college students showed a mean of 68.5 inches and standard…

A:

Q: The number of motorcycles sold annually by salespeople is normally distributed with a standard…

A: From the provided information, Population standard deviation (σ) = 15 Sample size (n) = 300 Sample…

Q: A random sample of 10 one year old Rainbow trout in a fish hatchery showed the average weight was…

A: From the given information Sample mean =1.2 Standard deviation = 0.8 We want to find 99% confidence…

Q: A personnel manager has found that historically the scores on aptitude tests given to applicants for…

A: N=9, Standard deviation : d = 82.4 Mean score : a = 787.9   P(a-t ˂ x ˂ a+t) = 0.95 P(a-t ˂ x ˂ a+t)…

Q: African women who attend yoga classes was found to be 31 years, with a standard deviation of 3.5…

A: As the population standard deviation is not known, we will use t Distribution. The degrees of…

Q: A study of 81 bolts of carpet showed that their average length was 77.5 yards. The standard…

A:

Q: The lead levels in a random sample of 23 crows in the region were measured and recorded. The mean…

A:

Q: The average time to be served at a diner is 12 minutes with a standard deviation of 3 minutes based…

A: Probability that sample mean greater then 13 minutes = 0.0984   Probability that sample mean less…

Q: The number of calories consumed per day for a child is normally distributed with a mean of 1544 and…

A: The number of calories consumed per day for a child is normally distributed with a mean of 1544 and…

Q: A Marketing researcher randomly selects 20 female students in a certain university and found out…

A:

Q: The mean length of six-year-old rainbow trout in the Arolik River in Alaska is 481 millimeters with…

A: Given data, μ=481σ=41P(X<501)=?

Q: A consumer group wants to estimate the monthly electricity consumption of households in a district.…

A: Given Data: ME=15 Confidence level=0.95 SD=40

Q: A study found that the mean systolic blood pressure was 106 mm Hg. Assume that the systolic blood…

A: It is given that mean and standard deviation are 106 and 8, respectively.

Q: The mean serum-creatinine level measured in 12 patients 24 hours after they received a newly…

A: State the hypotheses. That is, there is no evidence to conclude that the mean serum-creatinine…

Q: The mean reading speed of a random sample of 81 adults is 320 words per minute. Find a 90%…

A: Given: n=81, x=320 and σ=45.   The value of z at 90% confidence level is 1.645. (From the z-table)

Q: An advertising agency that manages a major radio station wants to estimate the mean amount of time…

A: Determine the sample size needed.   Obtain the critical value of z at the 95% confidence level.…

Q: A sample of 50 patients undergoing chemotherapy has a mean weight loss of 24 kg after they went the…

A:

Q: The average number of miles that 90 truckers drove in a day was 540 with a population standard…

A: From the provided information, Sample size (n) = 90 truckers Sample mean (x̄) = 540 miles Population…

Q: A physical exercise has a mean length of 20 minutes with a standard deviation of 5 minutes. A gym…

A: Obtain the sample size needed. The sample size needed is obtained below as follows : Procedure for…

Q: The mean diastolic blood pressure for a random sample of 60 people 89 millimeters of mercury. If the…

A: Given information: x¯=89n=60s=9 Confidence level=90% Significance level=10% df=n-1=60-1=59 t…

Q: The quantity of Calcium level in the blood of a man follows a normal distribution with a stand…

A:

Q: The quality control manager at a light bulb factory needs to estimate the mean life of a large…

A:

Q: A researcher would like to estimate the mean weight of all adult female American alligators in the…

A: We have given that. Sample size (n) = 146 Sample mean (x̅) = 217 Standard deviations (σ) = 16…

Q: The amount of material used in making a custom sail for a sailboat is normally distributed. for a…

A:

Q: The number of motorcycle sold annually by salespeople is normally distributed with a standard…

A:

Q: The amount of cloth used in making a wedding gown is normally distributed with a standard deviation…

A: Given Data: x¯=140σ=16n=25   As the population standard deviation is known, we will use…