A statistics professor wants to see whether a new in-class exorcise enhances stu

Question

A statistics professor wants to see whether a new in-class exorcise enhances student understanding of a concept They decide to use the new exercise in their current class and document the performance of the students The sampling method used was: A Convenience B Simple random C. Systematic D Stratified E Cluster The study conducted is: A observational B experiment A botanist wants to understand the effect of temperature on the germination success of a particular plant They acquired a batch of seeds for this plant then randomly sampled 60 seeds from the batch From those 60 they randomly selected 20 to be planted at ambient (room) temperature, they randomly selected 20 to be planted at colder than room temperature, and they randomly selected 20 to be planted at warmer than room temperature They recorded the day of germination for each seed. The sampling method used was: A Voluntary B Simple random C. Systematic D Stratified E Cluster The study conducted is: A observational B experiment A scientist was interested in whether changes in "screen time.' the amount of time each day a person sits in front of a screen (television, computer monitor, tablet, smartphone, etc.), modifies the ability to concentrate on a task away from the screen (a puzzle) They posted a notice on bulletin boards at the campus of a local university soliciting participation m the study They ended up with 32 subjects who signed up. Of the 32 subjects they randomly assigned 10 to spend an hour reading, then work on the puzzle. They randomly assigned 11 to spend a half hour reading, a half hour surfing the internet, then work on the puzzle They randomly assigned 11 to spend an hour surfing the internet then work on the puzzle The scientist recorded the performance on the puzzle for each subject. The sampling method used was: A Voluntary B. Simple random C. Systematic D Stratified E Cluster The study conducted is: A observational B. experiment

Explanation / Answer

1. Correct option: Convenience :

REASON: It relies on data collection from population members who are conveniently available to participate in study.

2. Correct option:

B: experiment.

REASON: They are conducting new exercise specifically for this purpose and not just observe from the available source.

3. Correct option D: stratified.

REASON: Here, the researcher divides the population into seperate groups: here: ambient (room) temperature, colder than room temperature and warmer than room temperature.

4. Correct option: B. Expermental.

REASON: They are conducting actual experiment with seeds on these 3 different temperatures and not just observing from available data.

5. Correct option: E. Cluster

REASON: here, the total population is divided into clusters and simple random sample of the groups is selected. The elements in each cluster are then sampled. Here the various clusters are:

- one hour reading,

- half hour reading & half hour surfing

- one hour surfing

6. The correct option:

B. Experiment

REASON: they conduct special experiment for this analysis ad not just observe from existing data.

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