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Menstruation; Whats happening to my body?

Contents [ hide ] Introduction Actually, what you are experiencing is a normal physiological process that begins once a girl reaches puberty. The first menstruation in a woman’s life is referred to as menarche , this could happen between the ages of 10 to 15 with most (the average) girls having theirs around age 12. It involves bleeding from the uterus at regular intervals. The end of menstruation is termed menopause , this usually happens between the ages of 45 to 55. Menstruation is therefore defined as the cyclical or monthly flow of blood and shedding of endometrium including mucus, some enzymes and unfertilized ovum. So, what really happens? Well in simple terms, it all begins with changes in hormones in the body. You can think of hormones as messengers that are sent by some organs of your body to tell other cells to do something. In this particular case, an organ called hypothalamus which is found in your brain begins the process. [Fast forward] The ovaries release f...
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Hypothesis Testing PowerPoint Presentation

Hypothesis Test for Means

  • A statistical hypothesis is an assertion about a parameter of a population.
  • Hypothesis testing is an application of statistical inference which forms a major part of statistics.
  • It provides a well structured analytical method for making decision about population means.

 Types of Hypothesis

  • NULL HYPOTHESIS: the statement about the population parameter that will be assumed to be true during the conduct of the hypothesis test. Its denoted by H0.
  • ALTERNATIVE HYPOTHESIS: the hypothesis that includes all population values not included in the null hypothesis. It is denoted by H1.
    • Examples
    • The box cereal has a mean fill of 16 ounce. H0: µ = 16   H1: µ ≠ 16
    • Good year’s tire will last longer than its competitors, or more than 60,000 miles, H0: µ ≤ 60,000   H1: µ > 60,000

Steps to Formulating the Null and Alternative Hypothesis

  • The population parameter of interest (µ, ρ,σ ) must be identified
  • The hypothesis of interest to the researcher or the analyst must be identified
  • The null hypothesis will contain the equal sign, the null hypothesis will not
  • The range of the possible values for the parameter must be divided between the null and alternate hypothesis
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