stats

• • Random Sampling

  A simple random sampling or random sampling is a selection of 𝑛 elements derived from a population 𝑁, which is the subject of the investigation or experiment,
• A population refers to the entire group that is under study

  or investigation or group
• A sample is a subset taken from a population
• The normal curve or bell curve is a graph that represents the probability density function of the normal probability distribution.

  The normal curve is also called the Gaussian curve, named after the mathematician Carl Friedrich Gauss.
• Lottery sampling (Simple random sampling)

  A sampling technique where every member of the

  population has an equal chance of being selected.
• Systematic sampling

  A sampling technique in which members of the population are

  ordered in some way such as alphabetically or numerically
• Cluster sampling

  It is sometimes called area sampling, the population is divided into groups or clusters,
• Stratified random sampling

  A sampling procedure wherein the members of the population are

  grouped based on their homogeneity
• Multi-stage sampling

  It is done using a combination of different sampling techniques.
• Nonrandom Sampling Techniques

  is used when the sample is not a proportion of the population
• Quota sampling

  • The researcher limits the number of his samples based on the required number of the subject under investigation.
• Convenience sampling

  • The researcher conducts a study at his convenient time, preferred place, or venue.
• Purposive sampling

  • It is used in very small sample sizes.
• INFERENTIAL

  STATISTICS

  • It involves making inferences, predictions, or generalizations
• • ESTIMATION

  It is a process whereby we select a random sample from a population
•  Point Estimates - a single value that best determines the proposed parameter value of the population.
• INTERVAL ESTIMATION

  • also called a confidence interval

  • the interval of values that predicts where the true population parameter belongs
• A sample is a subset taken from a population,