Question
Asked Dec 6, 2019
1 views

A physicist examines 4 seawater samples for iron concentration. The mean iron concentration for the sample data is 0.185 cc/cubic meter with a standard deviation of 0.0446. Determine the 80% confidence interval for the population mean iron concentration. Assume the population is approximately normal.

Step 1 of 2 : 

Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

check_circle

Expert Answer

Step 1

Given data

Sample size(n) = 4

Sample mean = 0.185 cc/cubic

Sample standard deviation = 0.0446

Signi...

help_outline

Image Transcriptionclose

C.I: x+ to.2 CO4-1" Vn 0.0446 (0. 148, 0. 2215) => 0.185 ± 1.638 × V4 T.INV. 2T(0.2,3)) 1.638(From eхсel to.2 2,4-1

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.

Related Statistics Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: Harker and Keltner (2001) examined whether emotional well-being in later life could be predicted fro...

A: Hi, As per our policy we can answer only the first three subparts. Kindly repost this entire questio...

question_answer

Q: 7) A study of peach trees found that the average number of peaches per tree was 1025. The standard d...

A: The provided information are:

question_answer

Q: 27) The total blood cholesterol concentrations, in mg/dL, are shown below for a random sample of six...

A: 27) Excel Procedure for Regression: Enter the data for x and y in Excel sheet.Go to DataClick on Dat...

question_answer

Q: Please answer part d

A: d. Null hypothesis: H0: p=0.30. Alternative hypothesis: Ha: p>0.30. From the given information, t...

question_answer

Q: Giving a test to a group of students, the grades and gender are summarized belowGrades vs. GenderABC...

A: The given data is tabulated below:

question_answer

Q: Assume that 20.2 % of people have sleepwalked. Assume that in a random sample of 1452 adults, 303 ha...

A: a. The sample size, n is provided as 1452 and the probability of people sleepwalked is 0.202.The req...

question_answer

Q: For the purposes of this study, which variable(s) are explanatory and which variable(s) are response...

A: Explanatory variable:It is also known as the independent or predictor variable, it is used to predic...

question_answer

Q: You have selected a person at random. She is female. Given that she is female, what it the probabili...

A: The number of females is 502 out of 1,000 and the number of Hispanic is 72 out of 1,000.

question_answer

Q: 1. Find a 95% confidence interval for the mean for both the explanatory (Foot length) AND response v...

A: We are authorized to answer one question at a time, since you have not mentioned which question you ...