Question

*t***-Test for One Sample
Mean**

1. Let’s assume that lab rates require an average of 32 trials in a complex water maze before reaching a criterion of three consecutive error-less trials. To determine whether a mildly adverse stimulus has any effect on performance, a sample of 7 lab rats were given a mild electric shock just before each trial.

- Given research results that show a sample mean of 34.89 and a
sample standard deviation of 3.02, test the null hypothesis with a
-Test, using the .05 level of significance.*t* - If appropriate, construct a 95 percent confidence interval for the true number of trials required to learn the water maze.
- If appropriate, interpret that confidence interval

Your Answers:

*Research Problem:*Does mildly adverse shock have any effect on performance of the water maze?

*Statistical Hypotheses:*

*
H*_{0}:
.

*
H*_{1}:
.

*Decision Rule:* Reject *H*_{0} at .05
level of significance if
,

given that *df* =
.

*Calculations: *
.

.

* *
.

* *
.

*Decision: *
.

*Interpretation:*
.

*
*
.

* *
.

- Confidence Interval: .

* *

c. Interpretation: -

Answer #1

PL??

It’s well established, we’ll assume, that lab rats require an
average of 32 trials in a complex water maze before reaching a
learning criterion of three consecutive errorless trials. To
determine whether a mildly adverse stimulus has any effect on
performance, a sample of seven lab rats were given a mild
electrical shock just before each trial.
Question:
Steps:
Calculations or Logic:
Answer:
Given that X 5 34.89 and s 5 3.02, test the
null hypothesis with t , using...

Hypothesis testing (one sample t test):
1)
H0: Mean = 7.5
HA: Mean not equal to 7.5
X Bar = 8.5, SD = 1.2. n = 670, confidence interval: 95%
2)
H0: Mean = 125
HA: Mean no equal to 125
X Bar = 135, SD = 15, n = 500, confidence interval: 95%

Sample Statistic
Value of sample statistic
Sample mean () Body Mass Index (BMI)
21.65
Sample standard deviation (s) of Body Mass Index (BMI)
4.33
Sample size
92
(13 points) You will use information about the body
mass index (BMI) variable for the sample of adolescent girls to
perform a hypothesis test. You will test the claim that the mean
BMI for all adolescent girls is 21.0.
The null hypothesis is H0 : µ = 21.0. State the
alternate hypothesis for...

1.The sample mean is an unbiased estimator for
the population mean. This means:
The sample mean always equals the population mean.
The average sample mean, over all possible samples, equals the
population mean.
The sample mean will only vary a little from the population
mean.
The sample mean has a normal distribution.
2.Which of the following statements is
CORRECTabout the sampling distribution of the
sample mean:
The standard error of the sample mean will decrease as the
sample size increases....

1. For a pair of sample x- and y-values, what is the difference
between the observed value of y and the predicted value of y? a) An
outlier b) The explanatory variable c) A residual d) The response
variable
2. Which of the following statements is false:
a) The correlation coefficient is unitless. b) A correlation
coefficient of 0.62 suggests a stronger correlation than a
correlation coefficient of -0.82. c) The correlation coefficient,
r, is always between -1 and 1....

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