Question: The standard deviation of a normally distributed population is equal to 10. A sample size of 25 is selected, and its mean is found to

The standard deviation of a normally distributed population is equal to 10. A sample size of 25 is selected, and its mean is found to be 95.
a. Find an 80% confidence interval for m.
b. What would the 80% confidence interval be for a sample of size 100?
c. What would be the 80% confidence interval for a sample of size 25 with a standard deviation of 5 (instead of 10)?

Step by Step Solution

★★★★★

3.46 Rating (172 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

a Step 1 The mean Step 2 a normality indicated b z 10 c 1 080 Step ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

519-M-S-S-I (2220).docx

120 KBs Word File

Students Have Also Explored These Related Statistics Questions!

The middle 60% of a normally distributed population lies between what two standard scores?

What is the standard deviation of a sampling distribution called?

The standard deviation of a foreign asset in local currency is = 8.5 percent, and the standard deviation of the exchange rate is s = 5.5 percent. a. If the correlation between the asset return, in...

1) A new type of organic pesticide has been developed and will be marketed if it is at least as effective as its chemical-based competitor.List the null hypothesis, alternate hypothesis, and describe...

Question 1 2pts From a random sample of 58 businesses, it is found that the mean time the owner spends on administrative issues each week is 21.69 with a population standard deviation of 3.23. What...

From a random sample of 58 businesses, it is found that the mean time the owner spends on administrative issues each week is 20.53 with a population standard deviation of 3.23. What is the 95%...

Choose the correct answer. 1. A scientist wants to test whether participating in support groups will have an effect on the mood of people with depression. Her expectation is that participation will...

Use the following data for problems 15 17 25 39 13 16 24 28 19 21 12 29 23 21 20 30 14 17 21 22 1.a Find the 40th percentile. 1.b Find the maximum and the minimum. 1.c Find Q1, the median, and Q3....

Page 2 . Suppose that a population's distribution is graphed below. For each distribution, would a sampling distribution of sample means be approximately normal if the samples are of size 15? How...

Ovate, Inc., earns $140,000 in book income before tax and is subject to a 35% marginal Federal income tax rate. Ovate records a single temporary difference. Warranty expenses deducted for book...

Mason corporation is considering purchasing rental property that provides annual cash flows of $800,000. Rent is expected to increase by 1.8% annually for the foreseeable future. If Mason's return...

The Venn of technology illustrates the convergence of information technology with other types of technologies. a. True b. False

Describe the five Cs and how the framework could be applied to intervention with a person with ALS.

If the assumptions for a pooled t-interval are satisfied, the formula for a (1 )-level upper confidence bound for the difference, 1 2, between two population means is For a left-tailed hypothesis...

If the assumptions for a pooled t-interval are satisfied, the formula for a (1 )-level lower confidence bound for the difference, 1 2, between two population means is For a right-tailed hypothesis...

Identify the assumption for using the two-means z-test and the two-means z-interval procedure that renders those procedures generally impractical.

Ratios that help determine whether a company can access its cash and pay its debts that mature in less than a year are called (Liquidity; Market-Value or Market-based; Dividend Policy; Profitability;...

Lauryn's Doll Co. had EBIT last year of $42 million, which is net of a depreciation expense of $4.2 million. In addition, Lauryn's made $6 million in capital expenditures and increased net working...

Use the information in the table below, about the shares of BMO, to answer the next question: Asset Expected Standard Return Deviation Correlations Market BMO 1.00 ?? BMO Risk-Free Rate Market...