# Estimating Mean Germination Time of Strawberry Seeds

Not what you're looking for?

Suppose that we want to estimate the mean germination time of strawberry seeds. The germination times for the sample of strawberries we choose has a mean of days and a standard deviation of days. For each of the following sampling scenarios, determine which test statistic is appropriate to use when making inference statements about the population mean.

(In the table, refers to a variable having a standard normal distribution, and refers to a variable having a t distribution.)

sampling scenario

1. The same has size 85, and it is from a non-normally distributed population.

a. Z

b. T

c. Could use either Z or T

d. Unclear

2. The sample has size 75, and it is from a non-normally distributed population with a known standard deviation of 1.4.

a. Z

b. T

c. Could use either Z or T

d. Unclear

3. The sample has size 20, and it is from a normally distributed population with a known standard deviation of 1.4.

a. Z

b. T

c. Could use either Z or T

d. Unclear

4. The sample has size 14, and it is from a population with a distribution about which we know very little.

a. Z

b. T

c. Could use either Z or T

d. Unclear

5. The sample has size 13, and it is from a normally distributed population with unknown standard deviation.

a. Z

b. T

c. Could use either Z or T

d. Unclear

##### Purchase this Solution

##### Solution Summary

This solution briefly discusses the answers for each multiple choice question.

##### Solution Preview

1. The same has size 85, and it is from a non-normally distributed population.

a. Z

b. T

c. Could use either Z or T

d. Unclear

*sample size is large enough for us to assume the sample mean is distributed normally, So we can use T if the standard deviation is unknown, or Z if the standard deviation is known. (however, the difference is very small)

2. The ...

##### Purchase this Solution

##### Free BrainMass Quizzes

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

##### Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

##### Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.