Question

The yield of a chemical process is being studied. From previous experience, yield is known to...

The yield of a chemical process is being studied. From previous experience, yield is known to be normally distributed and The past five days of plant operation have resulted in the following yields 91.6, 88.75, 90.8, 89.77, and 91.1. Find a 95% two-sided confidence interval on the true mean yield.

(a) Calculate the sample mean. Round your answer to 2 decimal places.

xˉ =

(b) Calculate the 95% two-sided confidence interval on the true mean yield. Round your answers to 1 decimal place.

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
The yield of a chemical process is being studied. From previous experience with this process the...
The yield of a chemical process is being studied. From previous experience with this process the standard deviation of yield is known to be 2.8. The past 5 days of plant operation have resulted in the following yields (given in percentages): 91.6, 88.75, 90.8, 89.95 and 91.3. Use alpha=.05 (a) Is there evidence that the mean yield is not 90%? What is the P-value of the test? (b)What sample size would be required to detect a true mean yield of...
The yield of an active ingredient in a chemical plant is being studied. It is known...
The yield of an active ingredient in a chemical plant is being studied. It is known that the two most significant variables in the process are: temperature and pressure. Two levels of each factor are selected with two replicas in each case. The yield of the active ingredient was as follows according to the experimental design described above: Temperature Pressure Low High Low 90.4 90.2 90.2 90.4 High 90.5 90.7 90.4 90.1 Construct the ANOVA table for this experiment design....
Suppose that a population is being studied that has a known standard deviation of 34. Further...
Suppose that a population is being studied that has a known standard deviation of 34. Further suppose a sample of size 110 is taken, resulting in a sample mean of 340. Determine the Point Estimate and the Margin of Error for a 95% Confidence Interval for this sample. Round all calculations to two (2) decimal places.
The mean daily yield for a chemical plant was 880 tons in the past. The quality...
The mean daily yield for a chemical plant was 880 tons in the past. The quality control manager wants to know if the mean daily yield has changed or not. The manager randomly sampled 60 recent days, observed the daily yields, and found the average yield of 874 tons. Assume that the standard deviation of daily yield has always been 31 tons. (explanation please) We can also estimate the mean daily yield in the recent years (i.e. finding a confidence...
The average travel time from Newark, DE to Baltimore is being studied, call it random variable...
The average travel time from Newark, DE to Baltimore is being studied, call it random variable T. The researcher times 50 cars making the trip and finds the sample mean time to be = 58 min. Suppose the standard deviation of the trip travel time is known to be σT = 15 min. Compute a two-sided 99% confidence interval of the mean travel time. How many additional car trips would have to be observed so that the average travel time...
From experience, it is known that the life expectancy of tires is normally distributed. An independent...
From experience, it is known that the life expectancy of tires is normally distributed. An independent agency tests a random sample of 6 tires and finds the following life expectancies (in thousands of miles): 26, 34, 28, 31, 22, and 30. a) Find the sample mean = b) Find the confidence interval and the margin of error, E, (Round to 2 decimal points) for the population mean life expectancy of tires for 98% confidence level. Use s = 4.18. 98%...
The standard deviation of the weights of elephants is known to be approximately 15 pounds. We...
The standard deviation of the weights of elephants is known to be approximately 15 pounds. We wish to construct a 95% confidence interval for the mean weight of newborn elephant calves. Fifty newborn elephants are weighed. The sample mean is 244 pounds. The sample standard deviation is 11 pounds. Construct a 95% confidence interval for the population mean weight of newborn elephants. State the confidence interval. (Round your answers to two decimal places.)   ,   Sketch the graph. (Round your answers...
To study the effect of temperature on yield in a chemical process, five batches were produced...
To study the effect of temperature on yield in a chemical process, five batches were produced at each of three temperature levels. The results follow. Temperature 50°C 60°C 70°C 33 30 22 24 30 28 35 35 27 38 24 30 30 21 28 Construct an analysis of variance table. (Round your values for MSE and F to two decimal places, and your p-value to four decimal places.) Source of Variation Sum of Squares Degrees of Freedom Mean Square F...
To study the effect of temperature on yield in a chemical process, five batches were produced...
To study the effect of temperature on yield in a chemical process, five batches were produced at each of three temperature levels. The results follow. Temperature 50°C 60°C 70°C 35 29 22 24 32 27 35 34 27 40 23 31 26 27 38 1. Construct an analysis of variance table. (Round your values for MSE and F to two decimal places, and your p-value to four decimal places.) Source of Variation Sum of Squares Degrees of Freedom Mean Square...
Two catalysts may be used in a batch chemical process. Twelve batches were prepared using catalyst...
Two catalysts may be used in a batch chemical process. Twelve batches were prepared using catalyst 1, resulting in an average yield of 86 and a sample standard deviation of 3. Fifteen batches were prepared using catalyst 2, and they resulted in an average yield of 89 with a standard deviation of 2. Assume that yield measurements are approximately normally distributed with the same standard deviation. A chemist would like to know if catalyst 2 produces a higher mean yield...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT