Question researchers claim that herbal supplements such as, Ask an Expert

Statistics

Question: Researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory.

To test this claim, a researcher selects a sample of n = 25 college students. Each student is given a ginkgo biloba supplement daily for six weeks and then all the participants are given a standardized memory test.

For the population, scores on the test are normally distributed with ? = 70 and ? = 15. The sample of n = 25 students had a mean score of M = 75. Are the data sufficient to that the herb has a significant effect on memory? Use a two-tailed test with ? = .05.

Provide the z value you find in calculation (calculated z), the critical z that you compare it with and how you obtained it, and if you reject or retain the null in this instance

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M91417846

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

The population standard deviation for the height of high

The population standard deviation for the height of high school basketball players is 2.3 inches. If we want to be 95% confident that the sample mean height is within 0.5 inch of the true population mean height, how many ...

Your client wants to buy a business that provides financial

Your client wants to buy a business that provides financial advice to local small businesses. The firm generated $650,000 in cash flows during the previous year, and the discount rate to value firms in this sector is 11% ...

Hayley motorcycle company just paid a dividend of 14 today

Hayley Motorcycle Company just paid a dividend of $1.4 today, and is expected to pay a dividend in year 1 of $1.8, a dividend in year 2 of $2.3, a dividend in year 3 of $2.9, and a dividend in year 4 of $3.8. After year ...

A researcher wants to determine if there is a relationship

A researcher wants to determine if there is a relationship between media outlet (social media, newspapers, and radio) and interest in media by population group (youth, young adults, and older adults). What type of statis ...

Assuming that the bank wants assets with high yields and

Assuming that the bank wants Assets with High Yields and Liabilities with Low Costs then what decisions would the bank make for the Interest Rates on both Loans (Fixed Rate Corporate, Floating Rate Corporate, Installment ...

The probability that someone made a purchase at a store is

The probability that someone made a purchase at a store is 0.36. You randomly select 15 people who went to the store. The random variable x represents the number of people who made a purchase. a. Find the probability tha ...

Suppose a stock has just paid a 44 per share dividend d0

Suppose a stock has just paid a $4.4 per share dividend (D 0 ). The dividend is projected to grow at 15% for the next three years, then 6% thereafter indefinitely. What should be the amount of dividend in four year ...

Assume that the car lot contains 25 percent porches 35

Assume that the car lot contains 25 percent Porches, 35 percent BMWs, and 40 percent Volvos. Of the Porches, 20 percent have navigation systems, 90 percent of the BMWs have navigation systems, and 70 percent of the Volvo ...

Describe the steps you tooknbspthere are 652 males 396 say

Describe the steps you took. There are 652 males, 396 say they have been to dentist in past year. Give a confidence interval for 90% of the population proportion .

Consider random samples of size 800nbspnbspfrom a

Consider random samples of size 800 from a population with proportion 0.60. (a) Find the mean and standard error of the distribution of sample proportions. Round your answer for the mean to two decimal places, and your ...

4,153,160 Questions Asked
13,132 Experts
2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Recent Questions

Ask Statistics and Probability Expert