Question: It is known that a certain laboratory task takes the average person 2.5 seconds. A developmental psychologist was interested in whether older people take longer

It is known that a certain laboratory task takes the average person 2.5 seconds. A developmental psychologist was interested in whether older people take longer to perform this task. The psychologist tested 30 randomly selected 80-year-olds. Their mean time was 2.7 seconds, with standard deviation of 1.4 seconds. Use the steps of hypothesis testing at .05 level of significance and critical t value of 1.699. What should the psychologist conclude?

Reject H0 because the older people did not take significantly longer to perform the task.

Reject H0 because the older people took significantly longer to perform the task.

Fail to reject H0 because the older people took significantly longer to perform the task.

Fail to reject H0 because the older people did not take significantly longer to perform the task.

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

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

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Mathematics Questions!

References about this question: The t Test for Independent Means; The Distribution of Differences between Means; Estimating the Population Variance; Hypothesis Testing with a t Test for Independent...

1)It is known that a particular laboratory task takes the average person 2.5 seconds. A researcher was interested in whether older people are slower (take longer) on this task. The researcher tested...

PLEASE SHOW ILLUSTRATIONS AND COMPUTATION PLEASE ! PLEASE ! PLEASE! 1)It is known that a particular laboratory task takes the average person 2.5 seconds. A researcher was interested in whether older...

It is known that a particular laboratory task takes the average person 2.5 seconds (the variance is not known). A researcher was interested in whether older people are slower (take longer) on this...

1. The following two tables provide cell and marginal means for two possible results of a fictional two-way factorial study on the relation of age and education to cognitive outcome in older adults...

CASE STUDY When our old cost system was designed and implemented, it was state-of-that-art. But it no longer provided us with accurate numbers. The reported numbers were too aggregated to provide us...

Answer the following True/False, Multiple Choice, Fill in blank as QUICKLY AS POSSIBLE*. Please let them be correct answers. No explanation needed. 1 When conducting a one-sample t test, if a sample...

Write a summary of a research report on probation officer burnout. Locate and open Lewis, Lewis, and GARBY (2013)s surviving the trenches: the personal impact of the job on probation officers in the...

John Morton, director of materials management for Computer Products Corporation (CPC) in San Jose, is reviewing next year's plans for the supply of a component that is purchased from Osiega Ltd., a...

River Company just paid a dividend of $ 2 per share out of earnings of $ 4 per share. If its book value per share is $ 2 5 and its stock is currently selling for $ 4 0 per share, calculate the...

If a bank has more rate sensitive assets than liabilities, then a decrease in interest rates will __________ bank profits. (increase, decrease, or not impact)

Are you repelled by touches from strangers? What about touches from people who are not your age (children or the elderly)? What about being touched by a colleague or a professorsomeone you have a...

A Does the piercing even matter? What type of message does the tongue stud send?

Have you ever taken an online or distance-learning course? Were you happy with the instruction and the amount of interaction? It is challenging to both present and respond nonverbally in courses...